Only time I've ever had a problem it's been solved very well, ran out of gas at Salhouse, poor engineer had to lug a gas bottle down to the broad from the car park, only to find that actually nobody had told us there was a changeover valve on the two bottles, I sent him on his way with enough for a couple of pints and a chip supper for him and his lad. Other thing, same trip, main circuit breakers tripped meaning no immersion heater or shore power, again if it had been explained at the handover, we wouldn't have needed help, but I didn't think to look behind the sofa!