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There are double yellow lines there too but appeals have been won on confusion about mixed markings.

Post the PCN with no redactions.

OP, I understand stamfordman's point, but I don't think this applies in your case.

DYL may not be accompanied by traffic signs, the examples about mixed markings and their mixed messages apply, if I remember correctly, to single yellow lines which convey a waiting restriction [when used in conjunction with No Stopping markings] within a Controlled Parking Zone.

Whether there should be DYL - as in is there a traffic order to this effect- I don't know.

What are PCN number and car VRM...

It's a controlled zone. Yes the guidance says a single yellow should be reinforced with a waiting time plate.

But there is an issue with people not realising there is a single or double yellow given the zig-zags are also yellow and not knowing that zig-zags don't have a kerbside line.   

Could you pls advise on what grounds can I base my challenge? Thank you

The yellow lines are a bit degraded. About 10 years ago they changed from a single to double yellow.

They did lose a tribunal case when there was a single yellow where the adjudicator said it wasn't reasonable to know the zig-zags don't have a kerb line especially as there was no timeplate.

Thank you.

I would be grateful if you could check this wording:

Dear Royal Borough of Greenwich Parking Services,

I am writing to formally challenge PCN [Insert PCN Number], issued on [Date], for the alleged contravention of "Parking in a restricted street during prescribed hours." I believe this fine was issued in error, and I would like to present the following points in my defence:

1. Parking Location and Time
On the date in question, I parked outside a school with clear signage stating "No Stopping Mon-Fri, 8am-5pm." I ensured to park on a Sunday, outside the restricted hours. Additionally, I parked outside the residential parking bays and within the yellow school zone, assuming the restriction only applied during the specified weekday hours, and white residential marking.

2. Confusion Due to Mixed Markings
The area contains yellow lines ( not sure are these double or single) alongside school zig-zag markings, and white residential bays. The school markings and the Board clearly indicate a time-limited stopping restriction. I took the marking to allow parking outside restricted time. However, now it seems there is an overlap in signage and markings that create confusion about when parking is permitted, especially outside school hours.

Conclusion
Based on the unclear and overlapping markings and signage, I respectfully request the cancellation of this PCN. I look forward to your response.

Sincerely,

Thank you!

OP, just re-read what you've written pl and what, IMO, is the only inference which can be drawn.

The 'mixed messages' appeals have as far as I'm aware only applied to SYL AND where no additional traffic signs were present NB. even within a CPZ an authority may place repeater signs reminding motorists of the restriction.

The law as regards CPZ:
“controlled parking zone”
 either—
(a)
an area—

(i)
in which every part of every road is subject to a prohibition indicated by single or double yellow lines or single or double yellow kerb markings...... whether or not an upright sign to indicate the same prohibition is placed in conjunction with the line or kerb marking;


And as regards traffic signs:

Traffic signs
18.—(1) Where an order relating to any road has been made, the order making authority shall take such steps as are necessary to secure—

(a)before the order comes into force, the placing on or near the road of such traffic signs in such positions as the order making authority may consider requisite for securing that adequate information as to the effect of the order is made available to persons using the road;


(b)the maintenance of such signs for so long as the order remains in force


From a legal perspective IMO your problem is:
A traffic sign MAY NOT be placed to mark DYL (notice that the definition above refers to '..or the line' in the singular).

An authority may not erect a sign to the effect..'look out, double yellow lines about'.

And your reps as drafted seem to acknowledge seeing the lines, both SYL and DYL, whereas most, if not all, successful appeals are predicated upon not seeing the line which, when compounded by the absence of an upright sign, left the motorist unaware.

So where will you stand in your reps:

Did see lines, but thought they were SYL (I don't think we've yet discovered whether when you parked is actually covered by the CPZ anyway!);

Saw both types and was confused by this;

Didn't see any and focused solely on the No Stopping prohibition;

Or.....?