For those non-Accy based fans heading by train, London Midland trains are doing a half price 'Summer Sale' though you have to book it online and travel on London Midland services only. If you are traveling from or via London, Birmingham, Liverpool, Stoke, Crewe it may be useful to you.
£11.75 for a return London - Northampton, £15 Liverpool - Northampton.
Half price summer rail sale between 23 July and 4 September
You need to select the London Midland services only optionto get all available trains. Main advantage is that you canuse it on any LM service and are not restricted to certain trains.