I parked on the street in a completely unmarked area in Hillingdon Borough for 3 weeks. When I returned to the car the Borough had installed a sign saying residents parking and I was notified by post of two parking offences. Can I challenge the tickets?
It might help your case if you can prove that you were unable to respond to the first ticket - i.e. were you out of the country? or somewhere sufficiently far away that it was unreasonable to expect you to return to your vehicle?