Perhaps not the greatest surprise, but the unions have not reacted positively to the voluntary self-regulation of private equity proposed by the Walker Review. See responses from the TUC, GMB and Unite. The principal criticism is the failure of the review to deal with the issue of employee rights.
The FT reports that John McFall of the Treasury select committee is equally unimpressed. There's a fair (in my view) take on the review in The Times, which describes it as "the lightest of light touch self-regulation".