"He was detained within the grounds and did not get into any of the buildings," said Inspector Tony Rymer, of Gloucestershire Police.

A 55-year-old man from Bristol was arrested on suspicion of trespass on the Highgrove Estate early on Monday.

The man was questioned at Stroud police station and bailed until 26 March.

A Clarence House spokesman said: "This is a police matter and it is for the police to make a comment."