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Just Google local gas suppliers, it's geographically dictated to you really. I have a contract with air products so couldn't advise even if you were in London. As far as being safe is concerned, it really depends how stupid you are ;) it's compressed gas so inherently dangerous, and oxygen is a really boring and then all of a sudden really explosive gas so you could theoretically cause yourself some issues but as long as you don't take the piss I don't think it's likely you'll do yourself any harm.
deleted
Thanks for your help,
Where would you recommend to get it from?
Also how to be safe while doing it?