What is the Cheapest Supermarket?

Actually it could be Sainsbury’s

Probably Aldi or Lidl but Iceland have some pretty cheap stuff.I guess it much depends what you are buying aka the old expression always good to 'shop around'

I like the ones with cheap prices if you are a member

I believe Aldi and Lidl are the cheapest according to what’s reported by the press.

None, they are all expensive and about the same overall , may get something cheaper in one but other things are more expensive so overall I think it balances out if you just go to one store. Most stores price fix on basic items such as Milk, eggs, potatoes etc anyway these days. Petrol stations, supermarkets, energy companies , insurance companies all on par these days, no genuine competition anymore.