Sorry don't want to be rude, but would rather not name the company, as can imagine them reading these forums. Is the advice then to wait, and not respond? If it turns out both set of friends, and the neighbour are all unaware of visitors needing a permit to use visitor spaces, or even how the visitor system is administered, would that likely make the fine unenforceable?

Thanks - yes it say "parking charge", and it's from a private company, who's website says they're part of the BPA and presumably manages the car park on behalf of the flats.

Please could I seek some advice, my wife was visiting friends today who live in a private block of flats. The flats have parking for residents, and a number of specific visitors spaces allocated. My wife parked in one of these visitor spaces and when returning to the car, after around an hour, found a ticket attached to the windscreen with a fine for £100 (£60 if paid within 14 days). While our friends have a parking permit for both cars, they were unaware that visitors needed a permit on display, and have lived there for many years. We're seeking advice from another neighbour, and a friend who also lives in the flats to see if they were under the same understanding (or lack of). The signage in the car park does say private property, permit holders only and spaces only for residents or visitors. What I would like advice on is whether, if residents are unaware that visitors need permits on display, and for years all have had visitors using the visitors spaces without fines, whether the fine is enforceable? Does the parking company (or owners of the flats) need to make a certain amount of effort to make the residents aware of the rules regarding visitors / how to obtain visitor permits? thanks in advance, David