The Express report:

The elite soldiers from the Household Cavalry, who guard the Queen at Buckingham Palace, failed random drug tests.

Army chiefs are now battling to stop the public finding out how many are involved.

They argue the information could lead to the soldiers being identified which would breach their data ­protection rights.

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I am a journalist and author. I am a staff writer at the UK edition of WIRED magazine and in 2015 my book, Freedom of Information: A Practical Guide for UK Journalists, was published. I created FOI Directory in 2012.