Simon Harvey wrote in
s.com:

There is also the question of What's Down There. Subterranean London
is not unoccupied. It's a matter of legend that LU have only three
shots at goal when it comes to the exact positioning of a tunnel or
other excavation. If they're turned down, no reason is ever given.
They must simply guess again. If they're turned down three times, they
may not re-submit.

Hmmm you state this is "a matter of legend". Is it just that, or is
there any anecdotal -- or even hard -- evidence to back this up? And
have they ever hit the "three strikes and you're out" wall and had to
abandon plans for a proposed station?

You've piqued my curiousity now!

Iain