MA3K
We are not doing the Rotherhithe tunnel: no one likes it apparently (see first bridges thread)
We will go through the Greenwich FT South-North then the Woolwich FT North-South which lines us up for a nice ride back to the finish: Observatory Park (Greenwich hill).
Fair enough, I didn't fancy Rotherhithe much myself. Here's a Bridges II - revised version
I know nothing about SE London though, I'll just follow you locals for the last bit.