Peter Lawrence wrote:
Delayed commuters will be frustrated since, as might be expected,
mobile phones do not work on the platforms (does the technology exist
to fix this?).

Yes, it's perfectly possible for a micro-cell site to be installed in
the platform area: http://www.mobiledia.com/glossary/162.html

I would have thought, given the tight deadline that it wasn't high in
the list of priorities (just like the shops in the rest of the station
which were delayed in favour of more important bits of the station!) ...
but then commuters don't expect mobile phone reception in any another
below ground station