I recently dropped a set of keys back into a letting company and parked in a bus stop right at the end as there is double yellows everywhere and would have held up traffic.
I was in the letting company for probably 1-2 minutes came out and away i went,then 2 weeks later a ticket drops through my door and i had been done from a mobile CCTV car!which i didnt even know existed.
I have since seen said car and its a little thing with a camera stuck on a pole.
as in previous post, assuming aforementioned restrictions dont apply, id contest it, if you contest within 14 days, the penalty reduction fee discount is still sustained until they deem your cotest unsustainable, in which case, pay them the reduced rate asap!