Here is the timetable for events surrounding the funeral of Baroness Thatcher today.
0800 - Flags lowered to half-mast over UK Government department buildings.
0900 - Doors open at St Paul's Cathedral.
0930 - The ceremonial route is closed to all vehicles.
0935 - The gun carriage leaves Wellington Barracks.
0945 - Street liners from the Royal Navy and Royal Marines, the Army and the Royal Air Force take position along the route.
1000 - Guests seated at St Paul's Cathedral. Coffin leaves, by hearse, the Chapel of St Mary Undercroft. The coffin is dressed with a Union Flag. Three Metropolitan Police Service motorcycles will travel in front of the hearse. An unmarked police car will travel behind the hearse.
By 1015 - Coffin placed in St Clement Danes Church by civilian pall bearers.
1015 - The Lord Speaker Baroness D'Souza, Commons Speaker John Bercow and Prime Minister David Cameron shown to their seats at St Paul's. Guard of Honour deploys to St Paul's churchyard.
1020 - The gun carriage will take up position at St Clement Danes. The procession band and escort party will take up position at St Clement Danes.
1025 - The tri-service bearer party will carry the coffin from St Clement Danes Church and place it upon a gun carriage of The King's Troop Royal Horse Artillery. The step lining party takes up position on the West Steps of St Paul's. The Bishop of London Richard Chartres and the Archbishop of Canterbury Justin Welby proceed to the Great West Door of the cathedral.
1033 - The gun carriage and bearer party and escort party, led by a band of the Royal Marines, step off for the procession from St Clement Danes Church via the Strand, Temple Bar, Fleet Street, Ludgate Circus and Ludgate Hill to St Paul's Cathedral. Processional minute guns are fired from Her Majesty's Tower of London by the Honourable Artillery Company for the duration of the procession. The first round will be fired when the wheels of the gun carriage start turning.
1035 - The Lord Mayor of the City of London Roger Gifford arrives at St Paul's Cathedral.
1040 - Members of Lady Thatcher's family arrive at St Paul's Cathedral.
1045 - Choir procession within St Paul's Cathedral.
1045 - The Queen and The Duke of Edinburgh arrive at St Paul's Cathedral.
1055 - The gun carriage arrives at St Paul's Cathedral, to be met by a guard of honour from the 1st Battalion Welsh Guards.
1100 - The bearer party carries the coffin into St Paul's Cathedral and the funeral service begins.
1155 - The funeral service ends and the guests depart. The bearer party carry the coffin to a hearse positioned at the foot of the West Steps of the cathedral. The cathedral bells ring half-muffled as the hearse leaves for The Royal Hospital Chelsea. The chaplain of the Royal Hospital, the Reverend Dick Whittington, will accompany the coffin. The Lord Mayor bids farewell to The Queen and The Duke of Edinburgh, who depart St Paul's Cathedral.
1210 - Guests begin to arrive at the Guildhall for a reception of friends and family of Lady Thatcher. A separate reception to be hosted by Foreign Secretary William Hague at the Mansion House for representatives from foreign states and other distinguished foreign VIPs.
By 1315 - The Prime Minister, senior ministers, the Lord Mayor, members of Lady Thatcher's immediate family arrive at Guildhall from the reception at Mansion House.
1430 - The National Anthem is played in each room by military musicians and the reception at Guildhall ends.
2000 - Flags raised from half-mast at official buildings.