Amicus and T&G

Concern is rising about the implications of the forthcoming merger of two of Britain's largest Unions - the Transport and General and Amicus. Concerns were recently expressed by T&G members in the Green Party Trade Union Group. Dave Osler blogged on the issue some time ago and returns to the issue today.
Dave's Part: Amicus and T&G: you read it here first
Now the Guardian appears to have picked up on the story too, though seem to be approaching it in a "red baiting" fashion. Somewhat strangely the story is credited to David Hencke, the Guardian's Westminster correspondent. It was Hencke who investigated the Neil Hamilton affair and blew the whistle on the Mandelson home loans story. Does this indicate something about the possible source of this story?