I remember about 30 years ago, my mum used to rent a telly from Radio Rentals. In amongst the small print on the back of the agreement was a disclaimer regarding the guaranteed call-out time should the set stop working. 'Acts of God and Nuclear Strikes are not covered under this guarantee'..I'm not sure that many people, regarding the latter, would be marching down to the rental shop, skin dragging behind them, to complain that they weren't able to watch Last of the Summer Wine.