The clue is the big ULTRALITE branding on the centrecap.
They're Ultralite A-tec's and are a perfectly easonable wheel in the Rota lookey likey style, in fact I think they were earlier copy-ists than Rota were.
But alas they are not Work wheels and hence I suspect you have been a bit conned. But they are still round, they are still a perfectly good wheel and have good tyres and hence are probably worth somewhere in the region of what you are asking, I just didn't want anyone who doesn't know to see the words Work, 18" and £800 and think they were getting a bargain !!