Are we allowed to mention Lordship Lane (E.Dulwich) and it's plethora of good food shops (butcher, fishmonger, cheese shop etc) or is that heresy!??
I also like the market in Lewisham for a couple of the veg vendors (Reddens in particular - stall opposite Superdrug) and i have to recommend 'Something Fishy' on Lewisham High St for fantastic fish & chips - great place to observe the fabulous diversity of the area (LBL) in its clientele (see Baggy Daves current thread!).

Yes, i know the above is not SE23, but i think it's fair to say that it's not all available on the doorstep right now - but there is good support for new shops when they do appear (and when they are good).

One thing i would say, the reason you are able to find such a great deal in this area (SE23) as opposed to Stokie is that there may not be so many resources AT THE MOMENT and historically, transport links (perceived or actual) south of the river have been neglected......but not for much longer...... I quite like the fact that this area is not so 'discovered' , but i've a feeling things are about to change.