Princess Anne has shared her “deep regret” at being forced to cancel a planned trip to Canada as the date for her potential return to duty remains unknown. The Princess Royal , 73, was released from hospital on Friday afternoon following five nights under observation after she was reportedly kicked by a horse . Buckingham Palace announced that she had sustained a concussion and minor injuries as a result of the incident, which was consistent with an impact from a horse’s head or legs.

It happened as Anne walked around her Gloucestershire estate on 23 June and emergency services, including a helicopter, were dispatched to the scene. After she was taken to hospital, her engagements for last week were postponed and her trip to Canada, which was in commemoration of the First World War, was cancelled. Former BBC royal correspondent Michael Cole claims that Anne, who is reported to be the hardest-working royal, chose not to be pictured as she was discharged from the Bristol hospital.

He said that recovering from a concussion is “no minor matter” – a view shared by brain and cognition expert Natalie Mackenzie , who told The Independent that the symptoms can last up to two weeks. The brain and cognition expert added: “Concussions are always potentially dangerous in terms of long-term symptoms if they become more severe”. Mr Cole said that, in his opinion, Anne will not be returning to work “for the foreseeable future”.

He said: “What is known is that the princes.