Oban, having recently looked into advance rail bookings which I might need after arriving at a UK airport, I noticed that the cheap fares are not only non-refundable but for specific trains (same as airlines with specific flights). Consequently that is not an option because of possible delays to the arrival of my flight, or I have to allow X number transfer hours most likely resulting in having to hang around. If I compare UK unrestricted rail travel costs with the country I live in, UK prices are extortionate.