I'm pretty sure this is against Sythe rules? Don't mean to be rude or anything, just giving you a heads up.
Although, my only adivce to you Skid is to do this (I'm from the UK too).
Don't bother wasting your money on fake ID's they seriously will not work, I've had friends who purchased them when we were younger, decent and expensive ones which everytime were identified as fake and confiscated so I suggest you don't waste your money.
The best option is to find someone who looks like you who is 18, and ask if you could use their ID or even give them the money to get a copy of their provisonal or full driving license. I done this from 17-18, worked perfectly.