You've all made my day with the discussion above :)
You'll be happy to know that after searching several outlets and getting a couple of managers involved, I did eventually aquire a bottle of Absinthe. 50cl between three of us. I'm still considering whether to drink it neat or mix it with water and sugar (as reccomended). The plan at the minute is three beers, absinthe, walk to kebab shop, eat kebab, whiskey, more beer, go to pub, more beer, soco lemon and lime, whiskey.
If by then end of it I'm not in hospital or dead, I'll make a point of coming on here Sunday morning and letting you guys know what went down. If you don't see a post by noon, you should assume the worst ;)