I have a calor gas cylinder that I was intending to sell as I don't need it anymore. It has been brought to my attention that I don't actually own the cylinder and that I cannot legally sell it. Is this right? I can't remember anyone ever telling my this when I paid for it. So, did I just pay to borrow it then? If I can't sell it, can I give it away for free? Or would that also be breaking some gas cylinder handling rule?