Prince Harry visited a HIV hospital in London where his late mother Princess Diana once helped break down the stigma surrounding the illness by kissing an AIDS patient.

Harry, 31, chatted to staff and patients at Mildmay Hospital, which has been offering dedicated treatment to those living with the illness for more than 25 years.

Harry was told many stories of his mother’s visits to the hospital including one about a phone call Diana received from the boys’ school while she was at the hospital.

Kerry Reeves-Kneip, Mildmay’s fundraising director, told the Prince, “There was a telephone call from a school — one of you had clambered on to a school roof.”

Harry joked: “It was probably me”, and, when told his mother “found it amusing”, replied: “Phew.”