I thought I would use the best wisdom on the matter and not buy a return ticket. Instead, I hear you can get the price cheaper by buying singles or breaking your journey. So I played the game this lunchtime. I used the Gner booking site in conjunction with one of their special offers. Initial cost of London to Edinburgh return was 117. You may as well drive at that price. By varying day and getting singles, I got it down to 90 something, but that still wasn't good enough. So I tried to get singles to and from Newcastle, knowing full well that the train goes through there. 44 for the Newcastle leg as singles. Then Newcastle to Edinburgh. Some of the single prices were very cheap. I could have got tickets on the train I was on from the London Newcastle leg, but introducing a one hour pause, in which I could gan to starbucks in the toon, got the price down. The total: 64 pounds. I bought it, well them. Four tickets as a testament to a rip of rail service. Annoyingly, I later discovered that, travelling at those times, I could have done two London Edinburgh singles for 57. I could have sworn that they were not available when I started. So, I'm not a booking genius, but I've still saved a ton and also made my journey more interesting.