I don't think an Accrington - Bridgwater ticket is valid via Leeds.
It's not easy to work out whether the ticket is valid via Leeds or not.
Those train companies which use thetrainline for ticket selling allow travel and reservations via Leeds. Those companies which use WebTis do not.
Which is right? It depends on how the Routeing Guide is interpreted.
For an Accrington - Bridgwater journey, the only appropriate Routeing Point for Bridgwater is Bristol Group. Accrington has 3 Routeing Points: Blackburn, Halifax Group and Manchester Group. Blackburn and Manchester Group are appropriate Routeing Points for this journey, but there is no permitted route via Leeds if using either of these Routeing Points.
If Halifax is an appropriate Routeing Points for this journey, then travel via Leeds is a permitted route. It is an appropriate Routeing Point if the single fare Halifax - Bridgwater is the same or lower than the fare for Accrington - Bridgwater. But there are no fares of the same type by the same route that we can campare.
National Fares Manual NFM 05 CD said:
Accrington - Bridgwater
Standard Anytime Single (SOS) route Bristol £78.00
First Class Anytime Single (FOS) route Bristol £147.50
Halifax - Bridgwater
Standard Off-Peak Single (SVS) route Not London £92.20
Standard Anytime Single (SOS) route Not London £93.50
First Class Anytime Single (FOS) route Not London £205.50
Standard Anytime Single (SOS) route + Any Permitted £182.50
First Class Anytime Single (FOS) route + Any Permitted £273.00
In the absence of any fares of the same type by the same route, one booking engine assumes the fares check is passed; the other that it fails.