Prince Andrew is set to attend his first public engagement in a number of months at the memorial service for Prince Philip on Tuesday, but his ex-wife the Duchess of York and the Duke and Duchess of Sussex will be noticeably absent.

       The Duke of York will attend the event at Westminster Abbey on Tuesday, where other members of the Royal family, European royals and representatives from hundreds of charities will gather as part of a 1,800-strong congregation to pay tribute to the Duke's lifelong service to the country and Commonwealth.

       It will be his first appearance at a public engagement since he settled his US civil court case with Virginia Giuffre, and comes after months of laying low at his home in Windsor.

       The Duke will arrive alongside his daughters Princess Beatrice and Princess Eugenie, and their husbands Edoardo Mapelli Mozzi and Jack Brooksbank. However, the Duke's former wife, the Duchess of York, is not expected to be present and is not listed in the order of service.

       Also absent will be the Duke and Duchess of Sussex. Prince Harry has not returned to the UK since the unveiling of a statue for this mother at Kensington Palace in July last year, and he is currently taking legal action against the Home Office over his security arrangements while in Britain.

       Despite their absences, the event will still be one of the largest gatherings of the extended Royal family in many months, with the following members expected to attend: the Duke and Duchess of Cornwall; the Duke and Duchess of Cambridge; the Earl and Countess of Wessex and their children Lady Louise Windsor and Viscount Severn; the Princess Royal and Vice Admiral Sir Tim Laurence; Prince and Princess Michael of Kent; the Duke of Kent; and the Duke and Duchess of Gloucester.

       It is not confirmed which of the Queen and Prince Philip's 12 great-grandchildren could attend. The five oldest are Savannah Phillips, Isla Phillips, Prince George, Mia Tindall and Princess Charlotte.

       Prime Minister Boris Johnson, who publicly apologised to the Queen and the country over gatherings in Downing Street on the eve of the Duke's funeral, will also be in the abbey with wife Carrie.

       The ceremony will also be attended by around 30 foreign royals, many of whom were on the pre-pandemic guest list to Prince Philip's funeral. They will include Denmark's Queen Margrethe, Spain's King Felipe VI and Queen Letizia, the King and Queen of the Netherlands and Princess Beatrix of the Netherlands, the King and Queen of Sweden, and the King and Queen of the Belgians.

       Beyond the long list of royals and dignitaries, the memorial service will be attended by the Duke's wider family and friends, along with 500 representatives from his patronages and charities. They will include Sir David Attenborough, the actress Dame Floella Benjamin, and members of the military who were involved in his funeral.

       Two representatives each from more than 210 charities of which Prince Philip was patron or president have been invited to the service. The Duke was connected to 785 organisations during his decades of Royal duty.

       Those invited include the Seafarers' Charity, the Royal College of Art, the Caravan and Motorhome Club, the London School of Hygiene and Tropical Medicine, the Zoological Society of London, and the Royal Air Force Museum.

       His love of carriage driving is also reflected in the inclusion of British Carriage Driving, the Sandringham Driving Trials, the Scottish Carriage Driving Association and the British Driving Society.

       Two representatives from the private King Edward VII's Hospital, which cared for the duke for nearly a month shortly before his death, also received invitations.

       The Duke had never intended to have a memorial service as part of his Forth Bridge funeral plans. However, Covid restrictions meant almost all of those who would have been invited to his funeral were not permitted, with numbers limited to only 30 close family and friends.

       The lengthy list of charities - including scores of science, technological, sporting, military, conservation and health organisations - in the congregation demonstrates the depth of his dedication to Royal service.

       Over the years, Philip carried out more than 22,000 solo engagements and gave more than 5,400 speeches, as well as taking part in thousands of other engagements with the Queen and committing himself to innumerable obligations behind the scenes.