I forgot to mention that they could be explosive. It clearly states in the manual that if you struggle to light it and the pilot light keeps going out to wait three minutes to try again. Well obviously you take no notice of that and in a frenzy and rage you keep plunging away. In Italy I found out why you should wait. There was a loud bang and the cowl on the roof outlet literally got launched into space. I don't know how far it went but there was what seemed like an incredibly long period of time before it came crashing back down on the van roof.
I think that actually happened twice, also up on the isle of Arran I seem to remember. I'm not sure I recovered that one as I do remember having to buy a new one.
The Fridge was no better. The flue would get sooted and rusted up and it wouldnt light. In the absence of a compressor on one trip I can remember driving around at speed with the fridge vents removed trying to get enough air into them to blow out the crap. It worked and I got it lit. I left it lit until we went home.