they can only take the prosocution(sp) further if the have a time stamped video, and they are able to prove you were driving at the time,
I would contest it and ask, you may find the council are hoping people will pay without contention
Check with C.A.B. as well,
And surely the operative must be a traffic warden or some other 'traffic' enforcement befre they can even think about doing you
i would check this out before paying anything, and if you can fight it
