He issued the fixed penalty today?
Today your car was on your drive not on the public highway- therefore no law broken.
it will not stand up in court - its just up to you if you can be arsed with the hassle of fighting it.
Don't pay it though and I bet nothing else comes through about it - I doubt he'll even file it.
OOOOO am angry for you Stew - I hope you got his number this time