I've pasted some cases below (one refused, some on O/0) and highlighted bits.
I've also looked at the law on the numberplate font and what's interesting is that the number zero isn't there presumably because it's the same as the letter O, and the number 1 is there but not letter I (which I think is still used in Northern Ireland but not sure).
The point stands that you can enter the letter I instead of 1 and pay by phone system will accept it - you can try a dummy session with the app and take screenshots of what happens and whether the character I looks any different from the numeral one on the VRM font.
These Regulations revoke and replace regulations 17 to 22 of the Road Vehicles (Registration and Licensing) Regulations 1971 and regulations 18 to 23 of the Road Vehicles (Registration and Licensin...

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Case reference 2250021604
Appellant Peter Corner
Authority London Borough of Barnet
VRM LR16LGL
PCN Details
PCN AG46739796
Contravention date 01 Oct 2024
Contravention time 11:51:00
Contravention location Golders Green Road
Penalty amount GBP 80.00
Contravention Parked without payment of the parking charge
Referral date -
Decision Date 05 Apr 2025
Adjudicator Martin Hoare
Appeal decision Appeal allowed
Direction cancel the Penalty Charge Notice.
Reasons Mr Corner explained ‘I paid for a parking session at the location at 11.26am for one hour until 12.26 pm. I used the PayBy Phone App.'
According to the Authority ‘A wrong VRM was used to make a payment to park.
Letter I was used instead of number 1. It is the motorist’s responsibility to ensure the correct VRM is used when paying for parking.’
There is no realistic prospect that another car was parked , that Mr Corner gained any unfair benefit or that the Council lost money or suffered any real inconvenience.
The Council has relied on a distinction without a difference.This is a trifling matter. The law is not concerned with a trifle.
The appeal is allowed.
Case reference 2240559283
Appellant Jonathan Peter Holl
Authority London Borough of Brent
VRM RJ14OLR
PCN Details
PCN BT21872909
Contravention date 30 Apr 2024
Contravention time 10:38:00
Contravention location Oaklands Road
Penalty amount GBP 130.00
Contravention Parked in permit space without a valid permit
Referral date -
Decision Date 28 Jan 2025
Adjudicator Andrew Harman
Appeal decision Appeal allowed
Direction cancel the Penalty Charge Notice and the Notice to Owner.
Reasons The appellant appeared before me today at Chancery Exchange, accompanied by his daughter, who gave evidence on his behalf. Mr Ali, for the council, attended the hearing via telephone. The contravention alleged in these proceedings was that this vehicle was parked in a permit space without a valid permit. There was no dispute that although a visitor parking permit had been obtained for the vehicle via RingGo, it was purchased against vehicle registration mark RJ140LR. The registration mark of this vehicle as shown on its plates is RJ14OLR. On the council's case, as put by Mr Ali, the permit that was obtained did not provide cover for the vehicle against its registration mark given the digit '0' was used instead of the letter 'O'.
I acknowledged what is said, but in Regulation 15 of, and Schedule 4 to, The Road Vehicles (Display of Registration Marks) Regulations 2001, the prescribed font provides that the letter ‘O’ and the digit ‘0’ are identical, (as are the letter ‘I’ and the digit ‘1’). That being so I was not satisfied that this vehicle was parked without a valid permit where required and I accordingly found that the contravention did not occur.
Case reference 2250059618
Appellant Oliver Smart
Authority Royal Borough of Kingston Upon Thames
VRM AF14OSY
PCN Details
PCN QT10022448
Contravention date 15 Nov 2024
Contravention time 14:12:00
Contravention location St Philips Car Park
Penalty amount GBP 60.00
Contravention Parked without payment of the parking charge
Referral date -
Decision Date 02 Apr 2025
Adjudicator Michel Aslangul
Appeal decision Appeal allowed
Direction cancel the Penalty Charge Notice.
Reasons This was a video hearing. The Appellant appeared in person. The authority did not appear.
The main question to be considered is whether the authority has complied with its duty to act fairly.
The Appellant’s case is that payment of the parking charge was made in full, except that the digit ‘0’was entered instead of the letter ‘O’.
The case of the authority is that it is the driver’s responsibility to ensure that the letter ‘O’ should have been entered instead of the digit ‘0’.
In Regulation 15 of, and Schedule 4 to, the Road Vehicles (Display of Registration Marks) Regulations 2001 the prescribed font provides that the letter ‘O’ and the digit ‘0’ are identical, as are the letter ‘I’ and the digit ‘1’.
I am unable to be satisfied that the authority has complied with its duty to act fairly because it has failed to consider Regulation 15 of, and Schedule 4 to, the Road Vehicles (Display of Registration Marks) Regulations 2001.It is the authority’s responsibility to ensure that when collecting payment for the parking charge the computer program is such that it ensures that that the letter ‘O’ and the digit ‘0’ are identical, as are the letter ‘I’ and the digit ‘1’ so that the parking charge can be allocated to the correct vehicle registration, location and duration of parking and thereby avoid the issuing of a Penalty Charge Notice (PCN) as in this case.I am unable to be satisfied that the authority has complied with its duty to act fairly.
Case reference 2250059618
Appellant Oliver Smart
Authority Royal Borough of Kingston Upon Thames
VRM AF14OSY
PCN Details
PCN QT10022448
Contravention date 15 Nov 2024
Contravention time 14:12:00
Contravention location St Philips Car Park
Penalty amount GBP 60.00
Contravention Parked without payment of the parking charge
Referral date -
Decision Date 02 Apr 2025
Adjudicator Michel Aslangul
Appeal decision Appeal allowed
Direction cancel the Penalty Charge Notice.
Reasons This was a video hearing. The Appellant appeared in person. The authority did not appear.
The main question to be considered is whether the authority has complied with its duty to act fairly.
The Appellant’s case is that payment of the parking charge was made in full, except that the digit ‘0’was entered instead of the letter ‘O’.
The case of the authority is that it is the driver’s responsibility to ensure that the letter ‘O’ should have been entered instead of the digit ‘0’.
In Regulation 15 of, and Schedule 4 to, the Road Vehicles (Display of Registration Marks) Regulations 2001 the prescribed font provides that the letter ‘O’ and the digit ‘0’ are identical, as are the letter ‘I’ and the digit ‘1’.
I am unable to be satisfied that the authority has complied with its duty to act fairly because it has failed to consider Regulation 15 of, and Schedule 4 to, the Road Vehicles (Display of Registration Marks) Regulations 2001.
It is the authority’s responsibility to ensure that when collecting payment for the parking charge the computer program is such that it ensures that that the letter ‘O’ and the digit ‘0’ are identical, as are the letter ‘I’ and the digit ‘1’ so that the parking charge can be allocated to the correct vehicle registration, location and duration of parking and thereby avoid the issuing of a Penalty Charge Notice (PCN) as in this case.
I am unable to be satisfied that the authority has complied with its duty to act fairly.Case reference 225043512A
Appellant Florence Blatchley
Authority London Borough of Haringey
VRM LL67XOX
PCN Details
PCN ZN16286104
Contravention date 28 Mar 2025
Contravention time 13:39:00
Contravention location Frome Road
Penalty amount GBP 130.00
Contravention Parked resident/shared use without a valid permit
Referral date -
Decision Date 08 Jan 2026
Adjudicator Martin Hoare
Appeal decision Appeal allowed
Direction cancel the Penalty Charge Notice.
Reasons Neither party attended this video appeal hearing.
Ms Blatchley submitted ‘I did pay for parking using RingGo and made a genuine effort to follow the rules. However, the vehicle registration was mistakenly entered as LL67X0X instead of LL67XOX due to a small input error over the phone. This was not intentional, and payment was made for the correct location and time. Additionally, RingGo usually saves and prompts you to repark the same vehicle, so I believed the correct details were in use. I respectfully request that this be considered a minor error made in good faith.’
Ms Blatchley provided a receipt.
The Council accepts that the said mistake solely caused the alleged contravention. It received payment.
This is a trifling mistake. The law is not concerned with a trifle.Further,’ 0’ and ‘o’ are used interchangeably in the English language.
O definition: the fifteenth letter of the English alphabet, a vowel. See examples of O used in a sentence.
‘o
/ əʊ /
noun
1. the 15th letter and fourth vowel of the modern English alphabet
2. any of several speech sounds represented by this letter, in English as in code, pot, cow, move, or form
3. another name for nought’.
The appeal is allowed.
Case reference 2250459820
Appellant Antonio Da Cruz Oliveira
Authority London Borough of Islington
VRM HN71UTJ
PCN Details
PCN IZ35843058
Contravention date 18 Jun 2025
Contravention time 10:16:00
Contravention location Mercers Road
Penalty amount GBP 160.00
Contravention Parked resident/shared use without a valid permit
Referral date -
Decision Date 23 Jan 2026
Adjudicator Cordelia Fantinic
Appeal decision Appeal refused
Direction Full penalty charge notice amount stated to be paid within 28 days.
Reasons 1. Gale Astley attended by Teams video call as the Appellant’s Authorised Representative. The Authority did not attend and had not been expected to. Ms Astley confirmed receipt of the Authority's evidence pack. I reserved my decision, which is set out below.
2. Ms Astley explained that, in summary, the Appellant was carrying out work at a property for a Mr Davidson. Mr Davidson purchased a visitor's permit on 18 June 2025 for the vehicle at 10:12 for two hours. The Appellant and Mr Davidson have now realised that Mr Davidson mistakenly entered an uppercase "I" instead of the digit "1" when inputting the Appellant's vehicle registration mark (VRM) on the RingGo app. Ms Astley submitted that the Authority had not responded to Mr Davidson's representations within 56 days, and that Mr Davidson had been unable to reach anyone at the Authority by telephone to clarify the reason why the Penalty Charge Notice (PCN) was issued.
Ms Astley has provided a statement from Mr Davidson, copies of the permit purchased, correspondence with the Authority and a document showing different fonts used by RingGo and the Authority, in which "I" and "1" appear identical.3. Ms Astley said that she did not feel the matter should have got to this stage. The alleged contravention occurred as the result of a genuine mistake. There was no intention to avoid payment, Mr Davidson and the Appellant believed a valid permit had been obtained. The Authority is not out of pocket, the permit was valid for the location, time and date. Ms Astley said that the penalty was disproportionate and the Appellant was being treated as if he had intentionally tried to evade the charge. The Authority is not acting fairly or reasonably in its decision not to exercise its discretion. Ms Astley relied on her written submissions and evidence and I reserved my decision to considered all of the written submissions and evidence provided by Ms Astley on the Appellant's behalf before reaching my decision.
4. The PCN was issued at 10:16 on 18 June 2025. The photographs taken by the Civil Enforcement Officer (CEO) show the Appellant’s vehicle parked in a bay and the relevant sign, which advises that from Monday to Friday parking is for resident permit holders only from 10am to Noon. The CEO's notes record that RingGo was checked and no permit was found. In the circumstances that they observed, the CEO was entitled to issue a PCN as the vehicle was parked in a bay during its hours of restriction without a valid permit.
5. In its Case Summary the Authority acknowledges that there was a RingGo session purchased for the relevant time, but that vehicle HN7IUTJ was paid for instead of HN71UTJ. The Authority refers to the Service terms and conditions for purchasing permits on RingGo. The Authority has highlighted the relevant part, which sets out at Section 3 that the motorist/service user is:
"responsible for providing all of the necessary and correct details for your parking action, such as vehicle number plate ... The details you provide about your parking action are key for us to correctly process your parking fees. You alone are responsible for providing us with the correct details for your parking action and you will be responsible for paying any penalty charge or parking fee issued as a result of incorrect parking action details... incorrect use might
lead to penalty charges"
6. Based on the evidence before me I accept Ms Astley's account of events in full and I accept that there was a genuine error when entering the VRM, and there was no intention to avoid payment. Indeed, a parking session was purchased for the relevant date and time, albeit for VRM HN7IUTJ and not HN71UTJ, which was the vehicle that was parked.
However, the Authority’s position is correct in law. The session purchased by Mr Davidson was not valid as it was not purchased for the Appellant's correct VRM. Therefore, as a matter of fact, a contravention occurred.
7. The fact that the Authority did receive payment for parking, albeit for registration number HN7IUTJ, is not a basis upon which I can allow this appeal. The circumstances described by Ms Astley, the Appellant and Mr Davidson are mitigating circumstances. Mitigating circumstances do not amount to a statutory ground of appeal. They provide mitigation as to why the contravention occurred; they do not "undo" the contravention itself. The Adjudicator is unable to allow an appeal on the basis of mitigating circumstances. It is only the Authority is able to exercise its discretion and cancel a PCN on the basis of mitigating circumstances, and it has decided not to do so on this occasion. This is not a decision that I can interfere with.
Procedural impropriety
8. Procedural impropriety occurs where there is a failure by an Authority to observe any requirement imposed upon it by (a) the Traffic Management Act 2004, (b) the General Regulations, or (c) the Appeals Regulations.
9. Ms Astley has provided Mr Davidson's email to the Authority, sent on 18 June. The email challenged the PCN and the Authority's automated reply stated that a response would be provided within 56 days.
10. The Authority has also provided the correspondence between the parties, which shows the Appellant's submission to the Authority. This submission is undated, but refers to Mr Davidson's earlier email. The Appellant's submissions must have been sent after receipt of the Notice to Owner dated 17 July 2025. The Notice of Rejection was then issued on 20 August 2025.
11. In the Appellant's updated letter to the Tribunal, filed on 7 December, he states that Mr Davidson did not receive a reply to his email of 18 June until 11 September, after the 56 days.
12. The 56-day statutory deadline for an Authority to respond to representations refers to the "formal representations", in this case it means the representations received after service of a Notice to Owner. Mr Davidson's email of 18 June would be considered an "informal representation". It appears that it was not linked to this case, as it was from a third party and not the Appellant. The Authority's 11 September response to that email, which is not before me, would not be subject to the 56-day statutory deadline. The response was evidently sent after the deadline stated in the automated reply, but this delay does not constitute a procedural impropriety based on which I could allow this appeal.
13. The evidence before me shows that the Authority complied with the 56 day time limit as the Appellant's formal representations had to have been made after the Notice to Owner, dated 17 July, and the Notice of Rejection was issued 35 days later.
Conclusion
14. I have found that the contravention occurred. The Appellant and Ms Astley have not established a statutory ground of appeal. I am therefore bound to refuse this appeal.