My representations were copied and pasted from what you suggested:
Dear London Borough of Waltham Forest,
I challenge liability because the alleged contravention did not occur. The Schedule to The Road Traffic (Temporary Restrictions) Procedure Regulations 1992 provides that:
1. A notice shall be displayed in a prominent position at each end of the length of road to which the order relates and at the points at which it will be necessary for vehicles or pedestrians to diverge from the road, stating the effect of the order and, where applicable, the alternative route or routes available for traffic.
2. Each such notice shall be displayed throughout the period during which the order is in force and the traffic authority shall take all reasonable steps to ensure that the notices remain in a legible condition and continue to be so displayed for so long as the order remains in force or are promptly replaced as often as occasion requires during that period.
On this occasion there was no notice advising that a TTRO had been made, it follows that the order was invalid in any event.
Yours faithfully,
And here is the original PCN
