The Little Chef at West Meon in Hampshire can be found here:

http://www.streetmap.co.uk/streetmap.dll?G2M?X=464905&Y=126085&A=Y&Z=3

Usually popular on Sunday mornings with up to 100 bikes stopping for breakfast.

The standard Little Chef stuff and the staff can be a little slow at times, although they don't mind you taking up most of the restaurant with you helmets, leathers, tank bags, etc.