Barbeque gas - where to buy?

[TuttiFrutti]

We've just bought a new gas barbeque, and I thought it would be easy to pick up a canister of butane gas at, say, B&Q or Robert Dyas, but they don't stock it. Where can you buy butane/propane gas for barbeques?

Caravan centres or gardens centres usually do them. You but the canister with gas and then in future go back and have the canister refilled which is cheaper1

hardware store near us do them, also caravan centres.

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