Regarding the use of fake id, it is a criminal offence to make or use a fake drivers licence, passport or birth cert. (e.g. the state produced ones) but the other ones that are available on the web etc (e.g. dodgy vertification cards) are in themselves legal to make, sell and own... but as soon as you use one to purchase alcohol (when you are underage) it become illegal due to the fraudulent use you are trying to make.
Having said all that they do appear to work very well for this purpose, as may news reports attest (for example see
http://news.bbc.co.uk/1/hi/england/devon/36310 44.stm) - if you do get one be cautious with it and think hard about what you are planning to do, but having said all that I used to use one when I was a kid but stupidly had all my real details on it except my date of birth so when it finally got spotted as a fake I was in some degree of trouble (not too serious I must say) � so if you do get one make a fake name up too and that way if worst comes to worst you can leg it and leave the card behind without too much to worry about)
Sorry if anyone thinks I am encouraging an illegal act, I�m not really and I don�t think it�s a good idea to copy what I used to do (and this was one of the more tame things) BUT I am a realist and teens will always use these until we all have national scheme set up or ID cards forced upon us all by the state (another issue though).
All the best
undercovers