Blimey, Lada, a classic car for £4200, they are taking the piss surely. Weren't the import of them banned years ago because they would never pass the exhaust emissions test back then. They always used to joke that Lada's had good heated rear screens so that your hands were kept warm when you pushed them in the winter 
Not at all, so many were exported when they got into banger age/territory. they are very scarce in the UK, like that one being imported to feed the market.
The Lada Niva, is very much in demand, a nice low miles one I tried to buy at auction about 4 years ago sold for 14k if my memory is correct, it was def far more than the 5k limit I had set, first bid was higher than that.
Rarity, power, quirkiness, condition, miles, history or A Ford Blue oval, are the usual things that deem a car a classic, any 3 of them together is enough.