Now you're talking to me too Matt, this is great. You are more practical than me.
I didn't know about the lpg conversion(thanks Luke), this must cost money rather than just using a gas bottle, so is there a chance that there might be a reason for it such as health and safety, legal complaince, or an uninsurable risk?
Are you allowed to carry gas bottles Matt? Roofers and blacksmiths and many others do I know, I wonder what the ground rules are?
How much would an LPG conversion cost?( to power a heater)