Sainsbury's for us as it's nearest. Simple.
Re Waitrose my mum recently told me she was listening to the radio and heard a comedian say he'd been in Waitrose recently and overheard someone ask "do we need Parmesan for both houses dear?". When she told my step dad he said he'd once been inn their local Waitrose and heard a man say "please put the guava down, Orlando."
Sounds like the Waitrose visit is nothing like a visit to Lidl in Newhaven!!