Fears have been raised the Queen is under security risk

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Details of the exact routes and times of royal trips were made available 48 hours before take off.

The shock decision to release deails in advance are to warn private aircraft pilots and drone operators in order to minimise the risk of a collision following a number of near-misses with drones.

But experts expressed concerns this would encourage "terrorists, mad people and pranksters".

It comes after plans for the Royal helicopter trip from Windsor Castle to Cheltenham in Gloucestershire on Friday was made available hours before.