Steve M wrote:
Due to a width restriction in the Rotherhithe Tunnel, only certain small
minibuses can fit through (along the lines of the Mercedes vehicles used
on the old 395). LU did look at running a service through the tunnel
when the East London line closes to meet local demand between Wapping
and Canada Water etc, but found that any such service would be
overwhelmed by those making longer journeys.
Agree with what Steve says.
A few months ago a couple of officials came to the local community
council, and said substantially the same thing.

My suggestion would be to open the pedestrian entrances to the
Rotherhithe Tunnel - in Rotherhithe and in King George IV Park.
But I don't see that happening.