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If it is for light use and occasional heating of small components, then a torch that uses butane or butane / propane mix will be adequate, I bought a good one from Wickes for about £25 and the gas is about £3 a can.
If you are planning to use it for more serious work or heating larger bolts etc., the it would be better to go for a torch that uses Map gas, it is much hotter than butane, however these are much more expensive; £70 upwards.