Lewisham sainos has no windows and is a bit cramped. Charlton retail park sainos is the biggest on a single floor I have visited and is nice and spacious to walk around in. Good selection of pencils and envelopes also they have extra large cucumbers which I'm yet to see in other stores.
Lewisham Shopping Centre Sainsburys in at number one.
Because they were the only local shop that would sell me fags when I was 14.