In message , at 14:28:54 on Sun, 17
Aug 2014, Walter Briscoe remarked:
The TfL journey planner allows a "via", but not an "avoid". However, by
careful choice of "via" you should be able to force the use of specific
lines (eg 'via Bank' in your example).

The old one allows via, but often ignores it.
The new one has no obvious support of via.

I'm not sure what these "old" and "new" ones are. I simply looked at
whatever TfL journey planner popped up this morning when I searched for
it.
--
Roland Perry