4.   The future Duke of Edinburgh with his parents Princess Alice and Prince Andrew of Greece in the same year.

5.   Princess Alice of Greece and her son Philip, aged three, photographed in 1924, by which time they were living in France.

6.   Princess Elizabeth in February 1931, aged five, with her mother, the Duchess of York.

7.   Princess Elizabeth, her father King George VI and her sister Princess Margaret, photographed in July 1946, a year before her wedding.

8.   King George VI, Princess Elizabeth, Princess Margaret, the Queen and Prince Philip at the wedding of Patricia Mountbatten in October 1946.

9.   Princess Elizabeth and Prince Philip with children Charles and Anne in the garden of Clarence House, 1951.

10.   Seven-month-old Prince Andrew is the centre of attention as the family enjoy their annual holiday at Balmoral Castle in September 1960.

11.   Prince Philip in 1965 sharing a joke with famous comedian Jimmy Edwards at a polo match. Philip enjoyed the waggish company of show-business friends and would support their charity events.

12.   The Queen and the Duke of Edinburgh, the glamorous couple, at a state banquet in Lagos in February 1956.

13.   Ten years after their wedding, in their seats for the world premiere of the film Dunkirk on 20 March 1958.

14.   Prince Philip carriage-driving with Lady Penny Brabourne at Windsor Horse Show.

15.   Sharing a joke with his daughter-in-law Sophie, the Countess of Wessex, at the Derby at Epsom on 4 June 2011. The Queen’s horse Carlton Hall was favourite but came third, with Pour Moi winning.

16.   Prince Philip and his daughter-in-law, the late Diana, Princess of Wales, at a polo match at Smith’s Lawn in the 1980s. They had a difficult relationship as Diana did not always appreciate his advice.

17.   Prince Philip looking doubtfully at the Queen as she drinks a toast to the new century at the Millennium Dome in 2000. It was not an evening either of them enjoyed as they were forced into staged celebrations with the then prime minister Tony Blair.

18.   The Queen with five-year-old Prince Harry and Michael Mann, Dean of Windsor, on Easter Day, April 1989. Mann established an excellent rapport with the Queen and Prince Philip and was much loved by them both.

19.   Prince Harry and his grandfather, Prince Philip, at the Rugby World Cup final at Twickenham in 2015. Prince Philip enjoys being around his grandsons, especially at sporting events.

20.   Prince Philip painting at an easel during the filming of the 1969 TV documentary The Royal Family. He is a talented artist and enjoys his hobby while being extremely knowledgeable about the subject.

21.   The Queen riding with the Princess Royal in 2002. Age has not diminished her enthusiasm, and fifteen years later she takes every opportunity she can for a gentle hack. Despite safety issues she never wears a hat as it messes up her hair.

22.   The Queen laughing at Prince Philip as he stands to attention at Windsor prior to the Queen’s Company Grenadier Guards ceremonial review, 15 April 2003, a week before her seventy-seventh birthday.