hi everyone, I need some advice on gas bottles please. We have 2 Calor propane metal bottles in the caravan at the mo and want to get the lightweight bottles. My local Calor gas agent is willing to swap the empty bottle for a full light bottle (@£18.99) and also swap the completely full metal bottle for a light bottle as well. I have however hears that they are not that much lighter, so is it worth doing? BP do one but I hear that the shape is different and you need to change the regulators, which I dont want to do for expense reasons. Pros and cons to both, or have I not got all the facts? Any help much appreciated. Thanks, Brian