This is a fantastic place to eat, really good quality, large, hot jacket potato with lovely skin for £1, 4 different toppings, including my fave - cheese, beans, butter.
Breakfast butties including vegetarian sausage, £1. Slice of pizza, £1.50. Whole large pizza £6. 2 hash browns 50p in morning. There is a machine to help yourself to free filtered cold water with cups on it. Soft and hot drinks are self-serve, you're just given a cup ;)
QUite a lot of ASDA stores have them but annoyingly they have a terrible website with no filter+search options. You just have to search for your area and click on individual stores. Then look for "Express Diner" under facilites. Opening hours are not listed and it's hard finding out from Twitter or calling! I have now found out ASDA Eastlands in Manchester is open until 7PM Mon-Thu, 8:30 Fri+Sat and 4/5 (not sure) on Sunday.