Dave Larrington wrote:

1) Its a good idea to cross south from the Isle of Dogs and then
re-cross the river around Tower-Bridge.

Seems like quite a long way round, plus you would have to get off and
walk through the tunnel

Don't have to walk though Rotherhithe Tunnel [spelt right this time].
On-road cycling is possible and allowed - just not very good.

, which would be a big pile of pants if you
favour road shoes with sticky-out cleats...

It is through Greenwich or Woolwich foot tunnels - especially when lifts
aren't operational. The steps are a bad enough even without without
sticky-out cleats. Covers are absolutely essential there for Look cleats.

~PB