In message , at 16:24:25 on
Mon, 24 Jun 2019, Recliner remarked:

It's quite clear they simply don't care how much they disrupt the
traffic, for years on end.

That probably wouldn't be a permitted option with the M25 at Heathrow.

I'm sure they'll have pressure to reduce the disruption a little. But
nothing as drastic as your plan has ever happened before. Well, perhaps
since they stuck a platform over Oxford Circus overnight, to rebuild the
ticket hall, when I was a lad.

But in those days they'd re-lay whole major station throats in a matter
of days, not months.
--
Roland Perry