The Baptist Church (junction of Derby Hill and Dartmouth Road) was obviously demolished, but I don't know when and why. I used to go to Cubs in the church hall next door and once a month had Church Parade in the church.
There was a Co-op store where the (ex) Post Office used to be. It was a SSCS co-op, that's South Suburban Co-operative Society, and I was always reminded to make sure we got the "divi" (dividend, in cash) by quoting our membership number which was 246381 (that's from long, long ago: funny thing memory!) As a young boy fascinated by anything mechanical I just loved the overhead wires carrying the money, or the change and receipt from the central cashier: the little pots the size of a jam jar would go whizzing across the the store from a strong spring, on a taut steel wire. Tried to make one to set up in the garden, but didn't get very far with it.
Sainsbury's was on the site of the Red Cross Shop and their name is still in the mosaic on the front step. They also had a central cashier in a little booth at the back of the shop: shopping was obviously quite a slow process in those days!
The Local History section on the top floor of Lewisham Library has a very good collection of old photos and documents.