We already have a fairly comprehensive network of ‘intensive’ regular-interval inter-city services, both London-based and cross-country. There are, however, some awkward longer-distance journeys necessitating at least
one change of train. Perhaps we also need an ‘extensive’ secondary set of services, giving through journey opportunities on a low frequency (once or twice a day) to ‘plug the gaps’ and complement the regular interval network?
Possible examples might be Euston-Dumfries/Ayr, CardiffEdinburgh, Brighton-Manchester, and Leicester/ NottinghamGlasgow. David Cooper, Bletchley