The Duke of Sussex will be among the mourners at the Duke of Edinburgh's funeral on Saturday.
Prince Harry's return to the UK for the service is his first visit since he and his wife Meghan stepped back from royal duties last March.
Will Meghan be coming to the funeral?
No. The Duke of Sussex will be unaccompanied when he attends the service for his grandfather, who died last Friday at the age of 99.
The funeral will be held at 15:00 BST in St George's Chapel in the grounds of Windsor Castle.
Buckingham Palace says Prince Harry's wife, Meghan, remains at their home in California.
The Duchess of Sussex is pregnant with her second child, and has been advised by her doctor not to travel.
What will happen at the funeral?
Prince Philip's coffin will be carried in a specially designed Land Rover from the State entrance of Windsor Castle to St George's Chapel.
It will be followed by members of the royal family, among them Prince Harry, who will walk alongside his cousin Peter Phillips and his brother Prince William.
Only 30 people, socially distanced, will attend the funeral, in line with the government's current Covid regulations for England.
Mourners are expected to wear masks in line with government advice.
Has Harry had to quarantine?
Like other international arrivals, Prince Harry has had to follow the government's coronavirus travel rules.
These state that people arriving in the UK must:
- Take a Covid-19 test during the three days before departure and test negative
- Fill out a passenger declaration form (giving details of where they will be staying)
- Quarantine for 10 days and take further Covid-19 tests on day two and day eight
There are certain exemptions. You are not required to quarantine or take tests if you arrive in the UK from the Common Travel Area (Ireland, the Isle of Man and the Channel Islands).
Prince Harry has not had to self-isolate in a quarantine hotel (as the US is not currently on the government's "red list" of countries, requiring extra measures).
A spokesman for the Duke of Sussex says he is staying at Frogmore Cottage in Windsor - his former residence - and is observing coronavirus regulations.
The government advice says people can self-isolate in their own home, "with friends and family" or in a hotel or other form of temporary accommodation.
What are the rules governing quarantine and funerals?
Guidance on holding a funeral in England - during lockdown - says that mourners who have come from abroad can leave their place of quarantine "in limited circumstances, including on compassionate grounds".
This includes "attending a funeral of a household member, a close family member or a friend".
They must continue to self-isolate at all other times though and must follow the rules on social distancing.
How to follow the funeral on the BBC TV and radio
HRH The Duke of Edinburgh Remembered: BBC One, Friday 16 April, 19:00-20:05
The Funeral of HRH The Prince Philip, Duke of Edinburgh: BBC One, Saturday 17 April, 12:30-16:20 and 20:10-21:10
The funeral will also be broadcast on Saturday 17 April from 14:00-16:10 on Radio 4 and Radio 5 Live, BBC World Service English, BBC Radio Scotland and BBC Radio Ulster.
It will also be broadcast on BBC Radio Wales and BBC local radio with some variation in start times.