Dirt cheap student car

[fuzzy]

I'm 19, a student, and thinking of buying a car. I already have a full licence (since January last year) and had a car until about 6 months ago. What do you guys think about picking up a dirt cheap car for about £500 (like a 10 year old golf/polo)? And what other costs should I be aware of?
tax, MOT, car insurance etc


edit: Thinking about it. This should definitely be in motors. Could a mod move it. Thanks.