Can you get advances Bradford to Kings Cross (GC) and then London to Exeter (FGW or SWT) ?? Long way round, but may be cheap if you're lucky...
10:05 Bradford Int – 10:27 Leeds + 10:45 Leeds – 13:01 London King’s Cross £21.40 East Coast & Connections Advance bought at
www.eastcoast.co.uk
14:20 London Waterloo – 17:42 Exeter St Davids £26.50 South West Trains
If you were willing to leave earlier, you could use the following trains/tickets:
06:51 Bradford Interchange – 10:13 London King’s Cross £19 Grand Central Advance
12:20 London Waterloo – 15:37 Exeter St Davids £15 Megatrain
12:26 Exeter St Davids – 15:49 London Waterloo £10 Megatrain OR
14:26 Exeter St Davids – 17:49 London Waterloo £15 Megatrain
19:48 London King’s Cross – 22:48 Bradford Interchange £19 Grand Central Advance
This assumes no Railcards. Someone else might be able to improve on this.
It seems it's much too late for the cheapest Advances unfortunately.