[quote="weepej"I think the worst that could happen is that you're asked not to come back.[/quote]
I dont think that you are right, Weep. There are certainly cases of people being done for drink-driving on car parks.
This
http://www.clearanswers.co.uk/what-we-do/what-we-do-index.htm ,despite being from an ambulance chasing solicitor, may well be accurate
Quote:
Car parks which are used by the general public, such as those servicing supermarkets, shopping centres, retail parks, and other leisure or retail facilities, are governed by the normal laws which apply to road usage across the UK. This applies even if the car park itself is on private property and managed by the owner or the operator of the store or facility