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@J0nathan
There's laws and regulations around it. The fluorinated gases used have very high Global Warming Potential and are only supposed to be bought/sold and worked with by registered and qualified individuals and businesses: https://www.gov.uk/government/collections/fluorinated-gas-f-gas-guidance-for-users-producers-and-traders
You could probably do it illegally! https://www.bbc.co.uk/news/uk-59061805