My wife got the interesting A Century of Lewisham by John Coulter for Christmas. I like history, it was my degree, and I've always wanted to know about the places where I've lived. The internet makes this easier. It's surprising how much local amateur historical research is on the web.
There is a wealth of material about Lewisham to be found, but almost all of it relates to the last 100 years or so. In short, since the area became fully urban.
Is it that people are generally interested in the buildings and landscape that they can see around them (so, if you live next door to a castle or medieval church you'll want to know about that, and if it's an Edwardian terrace with bomb damage in Ladywell that will do for you) or is it that there's not much to write about Lewisham prior to 1880?