Split Ticket - More Details
Splitting your tickets for a particular journey is perfectly permissible under the National Rail Conditions of Travel, which states:
14. Using a combination of Tickets
14.1 Unless shown below, you may use a combination of two or more Tickets to make a journey provided that the train services you use call at the station(s) where you change from one Ticket to another.
14.2 If you are using a Season Ticket, daily Zonal Ticket, or another area based Ticket such as a concessionary pass, ranger or rover in conjunction with another Ticket and the last station at which one Ticket is valid and the first station that the other Ticket is valid are the same, then the train does not need to call at that station for your combination to be valid.
14.3 Some Tickets specifically exclude their use in conjunction with other Tickets. This will be made clear in the terms and conditions when buying such Tickets, and you cannot use such a Ticket in conjunction with another except as set out in 14.1 above.
14.4 In all cases you must comply with the specific terms and conditions of each of the Tickets you are using (for example, keeping to the valid route(s) and train services for which each Ticket is valid). It is your responsibility to check that you comply with the Conditions listed above.
There is no requirement to leave the train where you change from one ticket to another.
Passengers who have purchased flexible tickets are fine to travel on later or earlier trains but should ensure that the alternative services they board also stop at the splitting points.
The ticket office should also provide split tickets on request, although they may not necessarily know the best combination of tickets for your given journey. To help with this, Splityourticket provides information when you search for tickets that will identify potential splits for your journey.