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I hear that Sarah Brown is offering her diaries around our major publishers. The former Prime Minister's wife is well-known for . But I can reveal that she has also kept a traditional diary for several years now, and is looking to publish it.

Potentially at least, given her role at he centre of affairs in No 11 and No 10 for the last decade, the diary could be explosive, a rival to Alastair Campbell's bestselling diaries.

Alas, it seems Mrs Brown's recollections are, in fact, quite disappointing. I'm told she's unlikely to get much of a response from Rupert Murdoch's firm, HarperCollins, where senior editors have been reading them recently.

HarperCollins has a track record of trying to get the memoirs of British Prime Ministers and their spouses. But the verdict at HarperCollins, according to my source, is "there's not much commercial potential in them. The feeling seems to be we won't take them now."

Another firm likely to have been offered Sarah Brown's diaries are Random House, who are publishing the Blair memoirs this September.