What is the knig amongst cherished number plates ? Should they be jusged by how old they are, is so the recently sold S1 has got to be a favourite as it was the first registration number ever issued in Scotland and its British counterpart A1 seems to have gone underground with no one owning up to knowing where it is. Another measurement could be the cleverness of the number in spelling something out , such as DR51 NGH which spells Doctor Singh. Some other numbers are exclusive as they slipped through the net such as PEN 1S which should have been banned.