In message , at 11:38:15 on
Sun, 31 May 2015, Paul Corfield remarked:
If you were HAL you would have wanted guarantees about the revenue due
to you so you could pay off the debt incurred in constructing the
tunnels into Heathrow. I believe the agreement runs to 2023 when the
debt should be clear. Goodness knows what happens then.

I suspect that Heathrow will come properly "into the Zones", but HEx
will be allowed to run trains through the core, at least as far as
docklands (or Stratford if that's a more logical place to reverse them).
--
Roland Perry