He also said a raid by the watchdog had led to the closure of a database of 3, 000 names used to vet workers in the construction sector for more than 15 years.

BBC: Memory stick

The move follows recent disclosures about a UK-wide database of 3, 000 names used to vet workers in the construction sector for more than 15 years.

BBC: GMB union outlines Scottish 'blacklist' areas