Howard, that's a brilliant idea!

I own a couple of flats that are adjacent to the local hospital (Wythenshawe in South Manchester). Hospital staff and hospital visitors use my car park rather than the Pay & Display hospital car park.

A sign 'Residents Parking Only' has helped hugely although there are still some who push their luck. They usually find their cars are either blocked in by residents, and / or find a polite note stuck to their windscreen. It's worked quite well.

Right, time to buy some Tupperware containers!

JJ