I understand it is to do with an email that incriminates someone in a fairly drastic way. I do not know what the terms of the injunction are, but isn't this an injunction which the Labour Party should have asked for rather than Her Majesty's Government?Later. A number of bloggers are pointing out that the BBC originally accompanied their report on the injunction with a picture of Ruth Turner. It has since been taken down.
I am aware of the identity of the individual who is the subject of the email, but I think if I name them I'll probably be banged up at Heathrow on my return! And, dear reader, you wouldn't want that, would you?
Others suggest an e-mail "with Lord Levy's fingerprints all over it".
Later still: The International Herald Tribune casts a little more light:
The Metropolitan Police said in a statement that there were concerns that disclosure of information would impede the investigation, and that Lord Goldsmith, the attorney-general, was acting "completely independently of government and in his independent public interest capacity."