In message , at 12:01:31 on Wed, 20
Jul 2016, Neil Williams remarked:

To continue that "viability" test, where train services fall down
most badly is getting people to and from the early and late flights,
which are so commonplace in the lost cost and charter airline industries.

This is very true when not travelling to/from Central London.

I used to live inside the M25 and I couldn't get the first train and
arrive at Waterloo (same line) in time for the first Eurostar of the
day.
--
Roland Perry