The Prime Minister has called the blacklisting of workers by large construction firms "completely unacceptable" ahead of a Labour Opposition Day debate on the issue.
Responding to a question by Labour MP Ian Lavery during Prime Minister's Questions, Mr Cameron said:
– Prime Minister David Cameron
The blacklisting that occurred was a completely unacceptable practice. I think the previous government was right to bring in legislation to make it unlawful.
We've seen no evidence the blacklisting regulations introduced are not doing their job and the company responsible was shut down in 2009 ...
I do welcome the openness and frankness that Labour are using an Opposition Day debate to look at something that went wrong while they were in office.