Treasury officials wanted to call in police to determine how some of their documents were leaked, ITV News political editor Tom Bradby understands, although this has now been ruled out.
The situation is bad enough for David Cameron and Nick Clegg to have met today to try to bring a halt to the tit-for-tat leaking.
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After a frosty start, southeastern areas will be dry with increasing amounts of sunshine developing. It will remain cold throughout the day.