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LONDON, UNITED KINGDOM - JUNE 27: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Norton Knatchbull, Earl Mountbatten of Burma accompanied by his wife Penny, Countess Mountbatten of Burma attends the funeral of his mother Patricia Knatchbull, Countess Mountbatten of Burma at St Paul's Church, Knightsbridge on June 27, 2017 in London, England. Patricia, Countess Mountbatten of Burma daughter of Louis Mountbatten, 1st Earl Mountbatten of Burma and third cousin of Queen Elizabeth II died aged 93 on June 13 2017. (Photo by Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - JUNE 27: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Norton Knatchbull, Earl Mountbatten of Burma accompanied by his wife Penny, Countess Mountbatten of Burma attends the funeral of his mother Patricia Knatchbull, Countess Mountbatten of Burma at St Paul's Church, Knightsbridge on June 27, 2017 in London, England. Patricia, Countess Mountbatten of Burma daughter of Louis Mountbatten, 1st Earl Mountbatten of Burma and third cousin of Queen Elizabeth II died aged 93 on June 13 2017. (Photo by Max Mumby/Indigo/Getty Images)