i try my luck with all the tickets i get, get the letter sent off soon, and as soon as you get a reply with the faintest suggestion that it might not be valid, the time allowance on the ticket is suspended
one thing annoys me round here (north london) i told my friends they could leave their cars near mine (bank holiday weekend) when i had a party on the sunday. woke up to 4 friends having parking tickets before 8.30am as they have changed the rules, and you can now get tickets on single yellows on bank holidays
winds me up.....