Apply for a two month family and friends railcard free. Get 1/3 off for adults and 60% off for kids on most rail fares.
http://www.railcard.co.uk/trialcard/?awc=6235_1430896134_2e30d27ecdca3410a9bfb312a9b11609&utm_source=affiliate_window&utm_campaign=general&utm_medium=affiliates&utm_content=179283 (Not my affiliate link, I presume it's the Daily Mirror's).
http://www.railcard.co.uk/trialcard/?awc=6235_1430896134_2e30d27ecdca3410a9bfb312a9b11609&utm_source=affiliate_window&utm_campaign=general&utm_medium=affiliates&utm_content=179283 (Not my affiliate link, I presume it's the Daily Mirror's).