Hi
I use Adams gas 0800 1954445, great prices and no contract, don't worry about bottom feed (these are more expensive) I use a 3kg top feed and simply turn it upside down when filling, does exactly the same, think it paid about £18 for the bottle and then about £12 for each refill, when you no longer need it give the bottle back and they refund you for it. Refills are done on an exchange basis.