I know of a national building firm who recently got in a spot of bother with the various authorities, for both employing people with no right to work in the UK but on same day they did a check/raid at the big site they were on they also checked every-bodies cscs/jib cards etc, id docs right to work etc... they found many fakes, coincidentally all possessed by eastern Europeans and a couple of Africans, I am not tarring all with the same brush as many are hard working and qualified for the job. this though opened my eyes. I will avoid naming the company as there is some sort of action being taken but its a 10k fine for employing an illegal! From one of the site managers who is a close family friend, they have discovered they have a lot of Russians, Belarussians and others from that part of the world posing as eastern Europeans/EU nationals. as many are multi lingual they get away with it.