Just a quick tip, if you are planning on booking train tickets with your credit card, thetrainline.com will charge you £2. You can avoid this charge by either booking your tickets at a station, (use the site to find your routes, times and prices). Alternatively, you can often book via the train company directly. For example, FirstGreatWestern have exactly the same booking engine, the prices are exactly the same, yet they do not charge you for using a credit card.
However if you're planning on spending more than £200, then Quidco give 1% cash back on thetrainline.com.
Quidco says, 1% for each sale with a value over £25.