Actually, Lewes is really (and this is a serious Pythagorean secret), a massive maths problem. There is a restricted network of streets, with only two bridges across the tidal Ouse (Used to be only one, which must have made it more difficult). There are five processions, of variable length. Some of these may join together at certain times, but not all. Some of the streets are used by all societies, some are not. Obviously no two processions may use the same street at the same time, though some may turn back upon themselves. All societies visit the war memorial. Some societies must use certain streets in order to maintain their right to do so. Processions begin at about 5 and go on until about 10, and make repeat journeys, until they finally process to their firesite for the bonfire and the fireworks. Someone has to work all this out! Judging from the adherence to the projected times, they haven't got it right yet.

Penny