There's one just opposite the Harvester. We took our kitten there for her second set of jabs. (She'd already had her first lot when we got her from Battersea.) Mrs Ant reports that the vet seemed friendly and efficient. Not that you can tell much from a five-minute jabbing, but still...
It does seem that there are more people in East Dulwich in the 20-40 bracket than the 50+. I'm not saying whether that's a good thing or not, just saying what I see.
I'll nominate Google maps, not just for the site itself but also for its many uses. Such as this fine example: http://www.aardvarkmap.net/getamap-examples/examples-prince-phillip-gaffes.htm.
I'm fairly sure I've seen Audrey before, as I live round your way. Not seen her recently but I'll definitely keep an eye out. Best of luck finding her.