In message , at 13:09:05 on
Sat, 28 Mar 2015, Jarle Hammen Knudsen remarked:

An hour from London:

though not within "discount" day return distance :-(

What's that?

There are cheaper day-return fares over distances of ~50 miles.

It depends on the route whether there are day-return-only fares (which
is because of regular travellers abusing open returns) or
period-return-only, or sometimes a choice of both.
--
Roland Perry