I have had my Sip Mig welder now for about 10 years,It does what I want.However I'm fed up buying these disposable bottles of Gas and now I want to buy the gas in these bigger bottles.I use my welder occasionally... So the info I'm after is where is a decent place local to me, 10 miles north of Stratford upon Avon or 10 Miles South of Birmingham where I can get refillables bottle of gas say co2/Argon and its fittings to fit my SIP Mig. Any info would be appreciated.