Hi people, basically I'v been using disposable cylinders for a while now and I'v got to the stage where I'm fed up of having to by them constantly, now here is my question, a local pub just closed down and it just so happens that i know the lady who was running the pub and she gave me a gas cylinder free of charge, i no nothing about the larger bottles and having them refilled or swapped over for a new full one etc etc, I'm wondering if now that i have the bottle will any company swap the bottle over for a full one with me just paying for the gas and not the bottle seen as i have one too give to give back to them in exchange? I'v totally no idea how it works so if anyone can help me out it'll be much appreciated! Thanks