Plenty of pitfalls - plenty of info online about why.

I live in a private park (un-adopted roads), which has full public access due to there being a railway station within the boundary.

Although there are a few legit parking spaces on the "Station" road, the rest of the park was being badly abused by non-resident commuters.

The trustees of the park use Flashpark to police parking, but there are only two or three residents with permission to issue tickets (which are then sent to Flashpark for administration and as you say, they keep any fines).

The only problem is that for a parking ticket to be valid, the parking wardens have to photograph the offending vehicle always showing the number plate AND:

1. The Flashpark warning sign in the same shot.

2. The windscreen (for proof that no parking permit is on display)

Therefore getting proof of "illegal" parking is a bit like the landlord who offers credit, but only to punters over 85 who are accompanied by both parents.

Many years ago I worked in Edinburgh city centre. The company rented a collection of odd buildings behind a church - took 15 cars or so. Entry was via a short lane but you came across punters who would squeeze a small car near the entrance to the land - turning in meant shuffling back & forwards to get past.

Piece of packing tape, lift the door lock & you were in - in the days before car alarms. Handbrake off, push car forward onto the start of the double yellows......the owner never came back BUT a few months later someone else would try the same parking trick.

It was many years ago - car alarms were standard fit on upmarket cars or GTi owners who valued their cars.