Maybe the dog ate the missing letter?

This is interesting, if only because it is difficult to envisage circumstances in which both No 10 and Mr Davis can be telling the truth. The BBC reports:

Downing Street says Gordon Brown was unaware that one of his MPs may have been bugged by police as he visited a constituent in prison.
A government inquiry is under way into claims that Sadiq Khan's meetings with Babar Ahmad at Woodhill Prison were listened to by anti-terror officers.
Shadow home secretary David Davis says he wrote to the PM in December to warn him a Labour MP may have been bugged.
But No 10 said they could find no record of Mr Davis' letter.

The Tories have even published a copy of the letter (here).

So what happened to it? Downing Street is notoriously efficient at recording and distributing the vast quantities of incoming correspondence, so it is difficult to believe that the letter got lost in the bureaucracy. And a letter from a prominent member of the shadow cabinet would automatically be marked for the Prime Minister to see personally.

But, hey, perhaps the postie dropped it in one of the darker corners of Whitehall. No 10 does not - as far as I am aware - have a dog which might have inadvertently eaten it. Maybe,it just disappeared by magic.

We may expect to hear more about this mystery ...