As Guido has noted the Evening Standard has said - despite legal threats - that it is sticking with it's story that Jon Mendelsohn was involved in secret donation cover-ups. According to the Standard it considers its source excellent.
This source wouldn't be one of Harriet Harman's parliamentary supporters spotted in Westminster last night at Shepherd's Restaurant with the journalist from the Evening Standard that wrote the story, would it?
Nah... I'm sure it's just a coincidence! They wouldn't start stooping that low and stabbing each other in the back just to save their own skins? Would they?