Hi Russ,
I have an account with Air Products, so have Acetylene and Oxygen cylinders on rental. I set this up when I was running a limited Company several years ago and have never been aware of needing a license. Don't think that the laws have changed since then and am sure a big company like AP would be sure to uphold any legal requirements surrounding supply.
I love using gas as although more heat soak than TIG, it's a lot less fussy and more versatile too.
Gordon
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