A dress rehearsal took place before dawn today to run through the details of Margaret Thatcher's funeral.
The actual funeral will not require such an early start for the members of the armed forces, politicians, former world leaders and cultural figures who will attend the service for the former Prime Minister, who died at the Ritz a week ago after suffering a stroke.
Although not officially a state funeral, in accordance with Baroness Thatcher's wishes when making her funeral plans, the announcement of the lavish state-funded ceremony has brought a fierce backlash and potential troublemakers may be rounded up in police raids to avoid trouble on the day.
But what time is it happening? Who will be there? We've got all the details you need to know...
When is it?
The ceremony will take place on Wednesday 17 April, with the service due to start at 11am. The doors of St Paul’s Cathedral will open at 9am with guests asked to be seated by 10am.
That is the time Lady Thatcher's coffin will set off from the Palace of Westminster in a hearse.
The ceremonial route will be closed from 9.30am, with the gun carriage leaving Wellington Barracks at 9.35am.
Members of the Royal Navy and Royal Marines, the Army and the Royal Air Force will take their places lining the route at 9.45am.
Following its 10am departure from the Palace of Westminster, Lady Thatcher's coffin should be placed in St Clement Danes Church by civilian pall bearers by 10.15am.
At 10.20am the gun carriage will take up position at St Clement Danes, with the procession band and escort party also in position.
At 10.25am Lady Thatcher's coffin will be carried by the tri-service bearer party, made up of troops from units with particular links to the Falklands campaign, and placed on the gun carriage.
The gun carriage will depart for St Paul's at 10.33am.
Where is it?
The service is being held at London's St Paul's Cathedral, at Margaret Thatcher's request. Attendance is by invitation only. It will be followed by a private cremation in Mortlake, south west London.
How can I watch the procession?
A funeral procession will travel through the streets of London, first in a hearse and then on a gun carriage, from the Chapel of St Mary Undercroft in the Palace of Westminster to the cathedral just under two miles away, with members of the armed services lining the route.
Thatcher’s coffin will be taken by a hearse from the Palace of Westminster to the RAF Chapel, the church of St Clement Danes, in the Strand.
From there her coffin will be transferred to a gun carriage drawn by the King’s Troop Royal Artillery.
The impressive cortege will then proceed down the Strand, through Aldwych, then along the entire length of Fleet Street before rising up Ludgate Hill to the majestic St Paul’s Cathedral.
I don't want to go - can I watch on TV?
BBC1 will be showing live coverage from 9.15am to 12.15pm. We will be providing live online coverage and commentary.
What is planned for the service?
Lady Thatcher's love of poetry is reflected in her choice of TS Eliot's Little Gidding, which will be printed on the opening page of the Order of Service and William Wordsworth's Ode: Intimations of Immortality on the final page.
David Cameron and Lady Thatcher's granddaughter Amanda will deliver the readings from the King James Bible - of which she was particularly fond.
She specified the prime minister at the time of her death should read a lesson from the Gospels. Her choice of reading was John 14.1, which says: "Let not your heart be troubled: ye believe in God, believe also in me. In my Father's house are many mansions: if it were not so, I would have told you. I go to prepare a place for you."
Thy hymns have been confirmed as He Who Would Valiant Be, Love Divine, All Loves Excelling, Psalm 84 set to the music of Johannes Brahms, and the patriotic verse I Vow To Thee My Country.
The funeral address will be delivered by the Bishop of London, the Rt Rev Richard Chartres.
Who will be at St Paul's?
Her children Carol and Mark will lead the mourners. The Queen will attend, accompanied by Prince Philip. It is the first time the Queen has attended the funeral of one of her former Prime Ministers since Sir Winston Churchill's state funeral in 1965.
Hundreds of foreign dignitaries and top UK politicians have been invited. Former PMs Tony Blair and Gordon Brown and their wives Cherie and Sarah have confirmed they will be attending, as has Lady Thatcher's successor in No. 10 Sir John Major.
Singers Dame Shirley Bassey, Dame Vera Lynn, Elaine Page and Katherine Jenkins, actors Sir Michael Caine, Michael Crawford and Robert Hardy and composer Lord Lloyd-Webber and lyricist Tim Rice are also due to attend the service.???
Others on the guestlist include Joan Collins, broadcasters Sir Terry Wogan, Sir Trevor McDonald and Sir David Frost, fashion designer Anya Hindmarch and sitcom queen June Whitfield.
FW de Klerk, the last president of apartheid South Africa, will also be there as a guest of the family.
However, Neil Kinnock, the Labour leader defeated by Thatcher at the 1987 election, has said he will not be attending.
Ten members of staff from the Ritz hotel, where Lady Thatcher died on Monday, have also been invited to her funeral as thanks for the care she received. The 87-year-old had been staying at the five-star hotel since Christmas.
Former Soviet leader Mikhail Gorbachev is not attending due to health problems. Ex-US first lady Nancy Reagan, whose husband Ronald worked closely with Thatcher as the Cold War drew to an end, said she was "heartbroken" over Lady Thatcher' death but could not attend due to her age.
How much is it going to cost?
The funeral is expected to cost up to ?10million with the taxpayer bearing the brunt of the costs. It has been confirmed a "contribution" to the cost of the funeral will be made from Lady Thatcher's estate. The official cost to the public purse will be released after the service has taken place.
The security operation alone is set to cost ?5million. Police across the capital have been ordered to cancel any leave they had planned for Operation True Blue next ?Wednesday.
There could be more than 4,000 officers and 2,000 troops lining the route. Hundreds of specialist police will be working on counter-terrorism measures, with others carefully monitoring CCTV cameras for trouble spots.
Every corner of the route will be checked by sniffer dogs, with sewers and drains closed.
Should Margaret Thatcher have a ceremonial funeral?
8000+ VOTES SO FAR
What will we see?
Military personnel from the RAF, Navy and Army will line the route from Westminster to St Paul's. The coffin will travel part of the way by hearse before being transferred to a gun carriage at the Church of St Clement Danes, the RAF Chapel, on the Strand. The gun carriage will be drawn by the King's Troop Royal Horse Artillery. Six horses will draw the carriage, three of them mounted, with a sergeant riding alongside, an officer riding in front and three dismounted troops on foot.
A Bearer Party made up of all three services will walk alongside the coffin, and will include those from ships, units and stations notable for their service during the Falklands Campaign. Members will be taken from the Royal Navy/Royal Marines; the Scots Guards; the Welsh Guards; the Royal Artillery; the Royal Engineers; the Parachute Regiment; the Royal Gurkha Rifles; and the RAF.
Three military bands will play - their drums draped in black as a mark of respect.
A guard of Chelsea Pensioners, dressed in their traditional red tunics, will line the steps of St Paul’s as her coffin is carried in by bearers from units particularly associated with the Falklands War.
More than 700 Armed Forces personnel drawn from all three services will take part. Members of the Welsh Guards, the regiment that suffered some of the heaviest losses during the Falklands conflict, will be among the units involved, taking on roles including the coffin bearer party, lining the route the procession will take, and forming a Guard of Honour outside St Paul's.
Guns will be fired from the Tower of London but there will be no flypast - as Lady Thatcher herself requested.
A single, half-muffled bell will toll as the funeral cortege draws up to St Paul's.
Fourteen Chelsea Pensioners will line the steps as the coffin is borne aloft into the cathedral.
In front of the coffin, Michael and Amanda Thatcher, grandchildren of the former prime minister, will carry cushions bearing the insignia of the Order of the Garter and the Order of Merit and lay them on the Dome Altar.
At the foot of the lectern there will be two modest arrangements of white lilies and greenery. Flowers will ring the candle.
How will it affect travel in London?
Motorists are being advised to avoid Westminster and the City of London on the day of Baroness Thatcher's funeral next week.
On Wednesday April 17 a number of roads will be closed and some bus services will be diverted, Transport for London (TfL) said.
Blackfriars and Westminster bridges will be closed and some Barclays Cycle Hire docking stations will be suspended. But all Tube, London Overground and Docklands Light Railway services will run normally.
The bus diversions will begin from 6am and the road closures from around 7am. Among roads that will be closed will be The Strand, Fleet Street, Ludgate Hill, Whitehall, Kingsway and The Mall.
What's the dress code?
Guests at the funeral will be asked to wear full day ceremonial dress without swords, morning dress with a black waistcoat and black tie or dark suit, day dress with hat. Medals and decorations may be worn.
What are the invitations like?
Invitations will be sent out on Friday 12 April. The white VIP invitations will see guests seated under the Cathedral's famous dome. A red or green stripe will show whether they are to sit on the port or starboard side. Other invitations are colour-coded relating to where guests are to be seated in the cathedral.
Are there any more details?
Flags will be flown at half mast on UK government buildings and British embassies from 8am to 8pm on the day of the funeral.
The working title for the funeral's operation plan is True Blue - which has drawn criticism from Labour's Andy Burnham for politicising the event.
Thatcher requested there should not be a flypast as she considered it a waste of money.
Lady Thatcher's family have asked that if people wish to pay their respects, they consider making a donation to the Royal Hospital Chelsea, rather than laying flowers.
Thatcher’s love of Elgar’s classical music – especially Pomp and Circumstance – is expected to be reflected in the service.
The Number 10 website will have a condolence page on which people will be able to write private messages for the Thatcher family.
The public will be unable to attend the funeral service itself but can line the route of the funeral procession from the RAF Church in the Strand to St Paul's Cathedral.