"John B" wrote

At Bank, avoid District to Central and DLR to Central. District to DLR
and District to Northern are OK. Northern to Central is tolerable. Not
sure about how the W&C fits into things, since I've pretty much never
needed to use it...

It's quite a trek between W&C and anything else, though W&C to DLR is
tolerable. The interchange subway starts off using the bit of tunnel that
was bored when the W&C was built, in which the tunnelling shield was
abandoned. The subway passes through the remains of it.

Peter