Kevin wrote:

_____________

I must admit I'm surprised that this long-suggested idea hasn't been
adopted much earlier.

Because it has been timed to coincide with a general election of
course. The Watford MP is of course blowing his trumpet because
Crossrail are "Thinking about it" bot actually "Doing" nothing.
Notice how elections are thinking about doing soemthing then doing
somwthing else.

The main recent trigger, other than the election, seems to be the need to
divert traffic away from Euston during the HS2 rebuild.