Looking at the Gaslow website, the manual valves appear to be gas specific. I'm hazy about continental gas supplies, but I believe they vary from UK. As we plan to do a lot of continental touring would I need to buy both the propane and butane valves and change them in and out depending on whether we are in the UK or abroad? Seems like a faff. Or just buy an automatic changeover valve, which they say is compatible with either type of gas?