So you’ve gotten used butane gas (the blue bottles) all summer but now feel like touring all year. Were you aware that Butane freezes at temperatures approaching zero degrees so is of little use all the way through cold spells.
For winter touring you require propane (the red bottle) as this may easily deal with british extremes. If your caravan is fitted with a built-in regulator you do not wish to change the entire thing, just the pigtail (the section of pipe from regulator to gas bottle).
This is a propane pigtail fitted with 450mm of gas hose to make it easier to the job yourself (please take care, it’s gas!)