Being keen on aeroplanes is one thing, but collecting registrations is plum bizarre. As mentioned above, the more extremespotters seem to have little interest in the aircraft themselves, or are only interested in extreme geeky techie detail, rather than, as Aussie Andy put it, the wonder of flight and flying machines (not to mention the drop dead gorgeousness and general all round fabulousness of all pilots) . I love the idea of Spotter Patroller number 1 arguing with Spotter Patroller 2 about the number of fins on a Mark 2 as opposed to a Mark 3 Stinger Missile whilst Mr al Shaheed lights the blue touch paper and retires to a safe distance.