Its not that simple - depends when you are going, where you want to go (Gatwick, Heathrow, Manchester, Scotland, do you want to transit through somewhere - right now for a direct flight with a stable price you will find it hard to beat BA direct to heathrow on the overnight - daily from Doha - only drawback is an hour or so on the tarmac at Bahrain - if you can stomach that and dont want the hassle of a short stop over at dubai which is also a cheap alternative then BA is for you. Forget Qatar Airways direct - to the UK, they have just become SO uncompetitive