Betteronacamel

Hmm, not sure either of these qualify as 'supermarkets' - although if you live in Jermyn Street or St James' (in which case, lucky you) then I would concede your point, assuming you are not interested in the Tesco on Haymarket.

Waitrose (plus John Lewis) would suit me as an Avios partner as we have two that are local to us; our Tescos (of which there are four within staggering distance) are all the small types. Since we lost our M&S food store (now a gym - grrrr) the fall-back for us is Whole Foods or some of the local delis. The last time I went to a big Tesco I found it a bit depressing TBH.

Morrisons is useless for us; not even sure where the nearest one to us is.

As ever, each to their own.