Got it! It's awesome too! I'll post some pictures up at the weekend when I get the chance to take 'em. V5 doesn't mention anything special, so I think we've got to the bottom of it: it's not a special edition, just a rare spec! To the person who asked how much I paid, it was £1995. Genuine bargain if you ask me - 44k miles, one previous owner and fantastic condition. Couldn't really get a better car for so little outlay!
Just need to sort a couple of bits with it and it'll be perfect! The wipers are knackered, it needs new front and rear Alfa Romeo badges (gone all faded and nasty) and the "wood" interior trim is hideous, so that'll have to be changed for something less plastic-fantastic.