"Extreme Spotting"? There's already a TV show about that: catch it at 0330 on the Granada Men and Morons channel, presented by A A Gill and the fat floppy haired bloke fom Top Gear.
As for discussions of Spitfire variants, a salutary tale: two of us were arguing in the bar at North Weald over the one hanging from the ceiling. "It's a Mark whatever". " No, it's a mark something else, look at the tail". Sensible bloke at next table intervenes: "It's a model. Hanging from a ceiling. In a bar."