The split-finder website
http://www.trainscanbecheaper.info has suggested something (which throws up a question from me):
Hull-Castleford route not leeds £17.30
Castleford-Wakefield £3.20
Sadly, I don't believe the Hull-Castleford ticket has any valid routes apart from the twice a day (none on sundays) Goole-Castleford service.
My question is, _if_ he buys this ticket on a Sunday from the TVM at Hull Paragon, has a contract been formed that allows him to travel on that day? If so, can he go via Doncaster (or even via Leeds)?