I suggest that the Secretary of State's Statutory Guidance is consulted as well as the RTRA and regs issued thereunder.
A council MUST have a written policy regarding removal of vehicles;
This policy must 'have regard to' the SoS's Guidance.
So, they had to have towed under their policy and if this included reference to 'persistent evaders'(which it is obliged to do) then this must 'have regard to' the Guidance.
It is not possible to know upon which provision in their policy they relied until this is declared by them. The tired argument of 'we're allowed to remove a vehicle issued with a PCN' won't wash nowadays.
So, on what lawful basis did the council(I use this term because it is a power vested in the council) remove the vehicle after having issued five previous PCNs?
IMO, the reps against the tow and its associated PCN are:
(f)that the penalty charge or other charge paid to secure the release of the vehicle exceeded the amount applicable in the circumstances of the case;
You would expand on this with:
Continuous contravention therefore only the first PCN would have been valid. It therefore follows that the sixth PCN, which is the council's basis for removing the vehicle, is invalid and consequently any associated removal.
OP, until we see the pound paperwork in full then it's not possible to know whether 'procedural impropriety' might be additional grounds. (See edit below)
As regards the other PCNs, you can submit informal reps against each and I suggest that similar grounds apply:
(e)the penalty charge exceeded the amount applicable in the circumstances of the case;
This arises because the council failed to notify you that your permit was to be renewed and the attendant conditions e.g. cost etc, something which was established custom and practice for at least the past ** years, see copies of previous emails below. IMO, when you apply for a permit you enter into an agreement with the council, an agreement which in this instance was breached by them. IMO, it doesn't matter whether this agreement states that the council will notify you, custom and practice(which may be taken to form part of the contract) is that they did notify you. It therefore follows that you should not be penalised for their failure. Of course they might rebut this by showing you an email which they sent, but at least you would then know.
In respect of each PCN other than the first the argument of 'continuous contravention' may be advanced.
Wait for others.
Edit: I don't think things bode well for the council.
I haven't found their policy, but did come across this:
The Parking Enforcement Plan (PEP) is long overdue an update, having being last updated over 15 years ago.Which must mean that it does not 'have regard to' the Secretary of State's Statutory Guidance published October 2022 and this is a procedural impropriety.
Notice of proposed decision first published: 11/06/2024
Decision due: 11 Sep 24 by Cabinet
The Notice is probably inclusion in the council's Forward Plan, but the key point is that a decision would not be taken until 11 Sept. To use council planning jargon, while weight may occasionally be attached to emerging policies and plans, this must be limited. IMO, whatever the PEP might propose and however many iterations it's had before 11 Sept. are not relevant: the current policy is what's current and it doesn't comply with the Traffic Management Act's requirements and therefore 'procedural impropriety' are legitimate grounds for each PCN.
https://democracy.towerhamlets.gov.uk/mgIssueHistoryHome.aspx?IId=147357&Opt=0