Considering the Weston Manor in Oxford?
A VT member wrote the following comment about visiting Oxford:
Take a Pee by Yudhis
Alyways look for nice service area with a lot selection of food and comfy toilets. If you have the urge to go, just go to this nice service area. Also offer ranges from fast food at KFC, Burger King and McDonalds through to traditional meals, pizza, pannini and a wide selection of salads, sandwiches & pastries at Food Connection and Red Hen outlets.
More information http://www.welcomebreak.co.uk/location_details.php?id=19&go=More+Info