Christopher Jefferies told the Leveson inquiry that he believes his witness statement was leaked to the media by Avon and Somerset Police.
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Six people have been killed and a seventh is critically injured after a multi-vehicle crash in Birmingham in the early hours of Sunday.
It will be a frosty start for many across the UK with slow-clearing mist and fog across parts of central and southeastern England.
The prime minister says she has proven the "doubters" wrong but still faces opposition from both sides of the Brexit line.