There's an organisation called FASS
www.fass.org.uk which was formed by a number of recruitment agencies in the UK and Ireland, in an attempt to raise the standards of recruitment and in particular vetting of qualifications.
It set up a central Register, and I was one of those who registered, but that's on ice. It seems that the response from the airline maintenance industry was encouragement from safety-minded people such as Quality Assurance, but they were invariably over-ruled by the bean-counters who simply go for the lowest price regardless of safety.
It seems also that the CAA while giving encouragement to FASS did little or nothing to push the MRO's into really demanding what FASS is offering.
EASA is thinking about the problem, according to FASS, but in a time frame of years.
Meanwhile, I and my highly qualified, experienced and motivated contractor colleagues find ourselves working alongside people with false documentation more often that you would want to know about.