Yes
It's only long(er) distance journeys that can have open returns.
(bogus official shove it up your cunt, Mon 8 Jun 2009, 17:09, archived)

any way to get a return cheaper on a short journey?

( Cleisthenes morning sickness is a bitch, Mon 8 Jun 2009, 17:12, archived)

Nope, not for a one off trip anyway
If you were arsed you could use nationalrail.co.uk to work out just how far from Preston you had to start from to get an open/saver return, if it's not too far away you might save a few pence but not much.
(bogus official shove it up your cunt, Mon 8 Jun 2009, 17:17, archived)