I don't know about everyone else but I wouldn't plan on moving to the UK if i didn't have the funds to buy a used car. Even a 2k pound car will do nicely. Hell I don't plan on buying new anyways, not even a light used one. I'd rather have repair bills than a car payment any day. Although it helps since I work on my own car...
Repair bills can be more than the car itself is worth and running a car in the UK is expensive, which is why people do move/live here with out the funds to buy a car, especially if it is unnecessary (i.e. they can walk/use public transport instead).
I bought my first (and so far only) car last year. However, in the year that I owned it, I spent so much money on running it that it almost wasn't worth buying it in the first place.
For one year (please excuse my lack of car-part knowledge):
Car - £800
Insurance - £500
Tax - £120
Fuel - £1200
Service - £100
MOT - £60
2 new tyres - £60
New window - £110
Repair of 'clunking noise' - £80
Replacement of 'rubber thing' - £40
Cost of car: £800
Cost of running car: £2270.
Alternatively, instead of spending over £3000 on buying and running a car (and I was a student with limited income at the time), I could have purchased an annual student bus pass for £360.