OTHER than:
Limo (We refuse to conform!!)
Fire engine (lots of people do that too now)
Horse and carriage (too expensive)
Classic cars (works out at a lot per person)
Helicopter (nowhere to land)
Bus (won't fit)
I was thinking more along the lines of something original like a Rickshaw/quadracycle or something else you can pedal, but I live in East Kent and can't find any to hire. Same story with the Mystery Machine (Scooby Doo van), unfortunately 
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I don't mind if it's a bit weird, as you can probably tell =]. It's for at least about 4 or 5 people (more might join if it's a good idea!)