Okay, no laughing, but I have trouble proving my age sometimes. I even get asked for proof of age when purchasing (12) media, so you can imagine how buying (15) stuff is going to be when I'm actually old enough in October.
So, I'm looking to get identification of some sort. A last resort is Fake ID, which isn't too immoral considering nothing on it would actually be fake

The problem is, a) I don't want to go with the Home Office's solution and b) You've got to be 16 to have ID from there anyways.
So, I've no idea where to turn to get ID now. I could just carry my passport around with me, but then again losing it would be quite a big problem considering their price seems to get higher and higher. It's a pity that society has become a place where you need to be asked your age at every turn... but alas, this is a hurdle I need to jump (keeping in theme with the olympics

).
Any ideas? I'd like to be able to go and see movies without having to phone home or bring my passport...
edit: it has to be available in the United Kingdom!