What is that over-capacity on the Northern Line they are talking
about?!

Maybe wisely they did not mention the other way of getting from
Waterloo to Bank - th 521 bus which usually has 3 parallel queues at
Waterloo in the morning that snake their way right the way down into
the pit through which one has to walk en route from the mainline
station or, for the 3rd (rearmost) queue, which snakes right the way
into whatever the road is called where the Southbound 521s terminate. I
would estimate that well over 600 people are in those queues at any one
time in the morning peaks.

ANY reduction in capacity elsewhere, such as the entire closure of the
W&C will only exacerbate an already dire situation.

Marc.