How many people would have that rental agreement. We got given our cylinder by the dealer and never signed any contract. I suspect the majority never signed any contract so no contract in place anyway and if no contract nothing can be enforced. problem solved. In I would think that in addition the contract was for the original purchase and not subsequent purchases. Calor would be a total joke if they tried to prosecute anyone.
I can see both sides of this - Prof is right - anyone who acquired a Calor cylinder legally will have signed the agreement, and it DOES cover every refill / exchange. That said, Buckman is also right, very few of us will still have that bit of paper. Last time I bought a cylinder I made a conscious effort to put the paperwork somewhere safe - no idea where it is now, I suspect it was in the pile of documents I handed over when I traded in the caravan.
If Calor were serious about enforcing the cylinder refill agreements and everything that goes with them, they'd make it easier: They have their own copy of the agreement and I'd bet that if I challenged them to prove I'd ever signed one, they'd be able to produce an electronic copy of it. Yet if I want to return a cylinder and get my "deposit" back, it's up to me to prove that I legally have the right to return the cylinder.
To a point, if "dodgy" cylinders being in circulation causes Calor a problem, they've brought it on themselves: In one fell swoop they're making unavailable every cylinder size that will be the preferred choice of most of the leisure sector, and their response is "if you don't like it, other suppliers are available. Oh, and good luck disposing of your current Calor cylinders when they're empty - unless you're one of the 1% who've got their refill agreement, you can return them to us for scrap value or you can sell them on eBay or at the car boot sale, or you can find someone who will illegally refill them for you
Let me make clear, I'm not condoning any of those illegal actions, just that I understand why many will feel the temptation, and as Little basher says, Calor have proved by their lack of action that they're prepared to tolerate them.
Where I disagree with the Prof is not in his facts about the law - they're absolutely accurate - but in his priorities. The law is important (and ultimately, there for the protection of everyone), but the most important reason for not buying/selling/exchanging cylinders by any route other than the official one, is that at some point these cylinders are being refilled illegally, and quite probably unsafely: And that lack of safety should be our main reason for not condoning these illegal actions.