From what I know one of the Wifes mates at works Boyfriend is a part owner of one of the East european car washs you write of. They are all here legally at that one and get the minimum wage but are treated in a manner from what i hear which most Brits would not accept. Long hours in the cold with as much manual work as possible as opposed to buying expensive equipment or paying for heating.

I asked how you know they are all legal to the Wifes friend she said they get raided all the time!!

I also know in the past a few round our way were well know as places to buy drugs and what not. So i think many are kept a close eye on by the old bill.