Prince Harry has made a private visit to the HIV hospital where his mother helped to break down the stigma surrounding the illness by kissing an Aids patient.
The prince, who celebrates his 32nd birthday on Thursday, took a tour of Mildmay hospital in East London on Friday, nine months after paying a public visit to the facility.
Diana, Princess of Wales, was the first member of the Royal Family to have contact with a person suffering from HIV/Aids.
In the late 1980s, when many still believed the disease could be contracted through casual contact, she sat on the sickbed of a man with Aids and held his hand.
Both publicly and privately she supported the work of those helping patients, with late-night trips to Mildmay, and serving as patron of the NAT (National Aids Trust).
The prince has stepped up his work supporting the fight against HIV in recent months, speaking at an international conference in South Africa to warn against the threat of complacency.
He is back home in the UK after spending the summer in southern Africa, where he was helping with a project to transfer 500 tranquillised elephants hundreds of miles to save them from poachers.
The “500 elephants” initiative in Malawi is one of the largest and most significant elephant relocations in conservation history.
The prince, who left the Army last year after 10 years as an officer, has spoken of how he found it difficult to find the right job after leaving the forces, as he attempts to settle on his future career.
He admitted most jobs he looked at “were not going to work” alongside royal duties and others were “not even on the table”.
In turning 32, Harry is the age his father the Prince of Wales was when he got engaged to his mother.
Fifth in line to the throne Harry is also preparing for a high profile foreign tour in the autumn when he heads to the Caribbean on behalf of his grandmother the Queen.
The busy island-hopping trip will take him to Antigua and Barbuda, Barbados, Grenada, Guyana, St Kitts and Nevis, St Lucia, and St Vincent and the Grenadines.
He is also said to be looking to buy his first home – in Norfolk, close to the Duke and Duchess of Cambridge and their family. The Sun reported that Harry was interested in a £3.6 million pad with a swimming pool complex called Water Hall.