I travel from South Wales to Kent very frequently. Once upon a time the was a Sainsbury's Coffee shop at Bracknell rougly half way. A good cheap fryup, and coffee, and a Cigarette before hiting the road to hell (M25).Sorry - Now a Starbucks franchise. It's cheaper to have my coffee on the Motorway.
Starbucks ? The perfect place (after a warning) to detonate a pound or so of Semtex !!
Gareth