Find a dodgy looking printing company owned by some immigrant-looking people and speak to the little nervous looking guy in the back of the shop, ask him where he got his fake passport and look at getting one yourself. On a more serious note, i reckon your just going to have to try and wing it. Find out where your going going first, if its a pub then you should be alright so long as other people buy your drinks. If its a club then i'm sorry, i don't think you've got a chance in hell of getting in.