if you were going to the nearest working machine, had to que, got the ticket and walked back to your car directly, then you may be able to argue the case. if, however you stopped off at the shop for a paper! its gone.
worth arguing, but bear in mind the word reasonable. you are allowed a reasonable time to walk to the Nearest working ticket machine, stand in line for your turn, and walk directly back to your car, no deviations.
anything at all, outside the above and you lose.
a magistrate could determine what is a reasonable length of time to stand in the que at the nearest working machine to your car, but they have time lists and they can be produced. they know exactly when that machine issued what ticket and when. if it spews out 15 in 4 mins, then yours directly after that you may be lucky with a que argument as they do not expect you to run nor barge in! if it hasnt issued a ticket for 2 mins, you lose. and in all cases, it must be the nearest to your car. if it isnt, you lose. as there is 4 minutes in your favour you need to make sure it is the nearest working machine to your car. you can then argue the case that the ticket issuers machine was incorrectly set and that in itself means that you have been treated in an unfair and unreasonable manner. The CCTV footage could be used, but you are questioning the ticket machine and the traffic wardens machine times. so CCTV footage wont be relevent. anyhow, they will quote the data protection act at you to prevent you gaining access. makes no difference. you dont need it. they have to prove that the ticket you were issued with was done in a reasonable time frame bearing in mind your proximity to the machine and car.
however, it isnt their fault you did not look for the nearest machine!
you must also bear in mind, they get about 100 complaints a day all saying the same thing. so unless you can make a special case for yourself it may go west. but dont let this stop you. is it reasonable?
making a case for them to prosecute, which is what they do if you dont wish to pay, takes them time. so they have to issue notices to relevent parties. if there is any doubt, which could be vague or indeed unreasonable they will reconsider your penalty and decide, on this occasion, to not proceed, they will then insult you by telling you to observe the parking enforcements in that borough, next time you park there.
and one further point. do not, at all, question the motives behind your ticket! anybody ranting about local taxes, blocked drains etc. get no where.
stick to the point. you felt it is unfair to be ticketed for parking while you were getting the ticket to park. thats it. nothing else. you have to prove that thats exactly what you did.