A security operation involving more than 4,000 police officers is getting under way for the funeral of former UK Prime Minister Baroness Thatcher, according to BBC News.

Lady Thatcher's coffin will travel from Westminster and be taken in procession through central London for the funeral at St Paul's Cathedral at 11:00 BST.

Some 2,300 people, representing 170 countries, are expected to attend. The Queen will be among them.

Scotland Yard said it was expecting some protests along the funeral route.

Lady Thatcher, who was Conservative Prime Minister from 1979 until 1990, died on 8 April, following a stroke, at the age of 87.

She has been accorded a ceremonial funeral with military honors, one step down from a state funeral. The processional route will be lined by more than 700 armed services personnel. A gun salute will be fired from the Tower of London every minute while the procession is taking place.

As well as the Queen and the Duke of Edinburgh, all 32 members of the current cabinet will attend the service, along with more than 30 members of Lady Thatcher's cabinets from her time as prime minister.

There will be more than 50 guests associated with the Falkland Islands, including veterans from the 1982 conflict with Argentina, but Argentina's ambassador to London, Alicia Castro, has declined an invitation to attend.

In total, two current heads of state, 11 serving prime ministers and 17 serving foreign ministers from around the world will attend.

Six police forces from outside London have sent specialist officers to help with escorting foreign dignitaries.