Here you go:
Dear East Hertfordshire District Council,
I challenge PCN ET34311964 on the ground that the alleged contravention did not occur. Firstly, I draw your attention to diagram 1028.6 found at item 8 of Part 4 of Schedule 7 to the Traffic Signs Regulations 2016, which is mandatory for a restriction of this type. This diagram requires a broad 200 millimetre yellow line, but this line is missing from the road markings on Fore Street.
Furthermore I note the restriction on the upright sign is a waiting restriction, it follows that the exemption at regulation 8 of statutory instrument 683 of 2000 is engaged.
For each of the above reasons, the alleged contravention did not occur and the penalty charge must be cancelled.
Yours faithfully,