Prince Harry is planning to attend his grandad Prince Philip's funeral - and government guidance suggests it is within lockdown rules for him to fly in from the US.
Some had questioned whether an exception would be made for the Duke of Sussex to attend the proceedings, but there is a loophole allowing international guests to keep within England's current restrictions.
His wife Meghan will not be attending following medical advice due to her pregnancy, although it is understood she made every effort to join her husband.
According to guidance on the government website, those arriving from another country will have to self-isolate for 10 days.
This means they will have to stay at home for the duration.
However, there are limited circumstances allowing people to leave home - including attending the funeral of a household member or close family member.
Travellers are expected to self-isolate for the rest of the time and cannot attend any other commemorative events such as wakes.
Under England's current restrictions, only 30 people can attend funerals and the Royal Family is expected to stick to these rules.
The rest of the Queen and Prince Philip's eight grandchildren - Peter Phillips, Zara Tindall, the Duke of Cambridge, the Duke of Sussex, Princess Beatrice, Princess Eugenie, Lady Louise Windsor and Viscount Severn - are expected to attend too.
The Duchess of Cambridge will likely attend as a future queen, although it is unclear whether the other grandchildren's spouses - Mike Tindall, Jack Brooksbank and Edoardo Mapelli Mozzi - will attend.
Of course, we will also expect to see the Queen's four children and their spouses too: the Prince of Wales and the Duchess of Cornwall, the Princess Royal and Vice Admiral Sir Timothy Laurence, the Duke of York, and the Earl and Countess of Wessex.
It is also likely the Queen will invite her cousins and their spouses. They are Princess Alexandra, the Duke and Duchess of Gloucester, the Duke and Duchess of Kent and Prince and Princess Michael of Kent.
The monarch is close to the children of her late sister Princess Margaret - her nephew the Earl of Snowdon and niece Lady Sarah Chatto - so they may also be on the list.
The Queen and Prince Philip's 10 great-grandchildren, including Prince George and Princess Charlotte, are unlikely to be there as they will probably be considered too young.
Another spot could also be filled by a trusted member of the Queen or Prince Philip's household, or a member of the armed forces.
Prime Minister Boris Johnson has said he will not go and instead will give up his seat to allow another family member to attend.