Personally, I've had one of the latter - and the experience left me feeling sufficiently chastened to put an end to my red running days. Despite the arguments to the contrary, jumping a red light in Britain's current traffic system is so obviously unacceptable - morally, socially, legally - that you only have to be called out on it once to confront your behaviour. It's a bit like not doing the washing up when living with friends: you shirk your responsibility if you can get away with it, but deep down you know it's dishonourable.