A no-fly zone is to be enforced over the Duke and Duchess of Cambridge's Norfolk home following a request by the security services.

The development is a move to ensure the safety of William and Kate and their young family who spend much of their time at their Anmer Hall property on the Queen's Sandringham estate.

In the summer their communications secretary, Jason Knauf, highlighted privacy concerns in a detailed public letter, claiming that paparazzi photographers had been going to "extreme lengths" to capture images of the couple's children Prince George and Princess Charlotte.

The restriction comes into force on November 1 and prohibits planes and drones flying below 2,000 feet within a circular area 1.5 miles across.

The no-fly zone has been imposed by the Department of Transport under a form of legislation known as statutory instruments.

It states: "The Secretary of State has decided that it is necessary in the public interest to restrict flying in the vicinity of Anmer Hall, Norfolk, having regard to the security considerations associated with this location by reason of it being the residence of members of the Royal Family."

Anmer Hall, a 10-bedroom country retreat, was a gift to William and Kate from the Queen following their wedding.

The secluded red brick mansion is a short drive from Sandringham House and underwent a major refurbishment overseen by the Cambridges.

Exemptions apply to the new rule, with emergency services aircraft allowed to fly over the property along with the Queen's Helicopter Flight and aircraft invited to land at Anmer Hall.

Similar regulations have been imposed over Sandringham, with these applying every year for a three month period only from December 1 - covering the period when the Queen is on her Christmas break at her Norfolk home.

A Department of Transport spokesman declined to comment on the new regulations as it was a security matter.