Tim, as far as i know when you put a business card or leaflet on a car windscreen on any private car park, eg: council or supermarket you can be reported for doing so. A couple of years ago my boyfriend and me went and did some PR work for a local designer clothes shop and we went to Asda supermarket and just went round each row of cars in the car park and slipped the flier under each windscreen wiper,,,,a piece of cake!,,,,until the manager of the shop got a phone call from the council and Asda on the Monday !
, never the less, he still got plenty of customers that week after,,,,but think he was threatened with legal action by council and asda and told if he was found to be doing this again he would be took to court.
Tracey.