All former U.S. presidents, former UK Prime Minister Tony Blair and a raft of global dignitaries are invited to the funeral next Wednesday of former British Prime Minister Margaret Thatcher, Downing Street said Thursday.
The guest list also includes representatives of the Reagan family, Nelson Mandela's family and former U.S. Secretary of State Hillary Clinton, alongside sitting British Prime Minister David Cameron.
Any members of Thatcher's Cabinet who are still alive and members of the current UK Cabinet, as well as opposition Labour leader Ed Miliband, will also be asked to attend, Cameron's office said.
Among those expected to come are F.W. de Klerk, the last apartheid-era president of South Africa, Canadian Prime Minister Stephen Harper and one of his predecessors, Brian Mulroney.
Buckingham Palace has already confirmed that Queen Elizabeth II and her husband, Prince Philip, will be present.
With full military honors, the funeral will rival those given to Diana, Princess of Wales and the Queen Mother.
More than 2,000 invitations -- color-coded to indicate where the guests are to sit -- are being sent out, Cameron's office said. They are due to be mailed Friday.
Details of the very formal dress code will be sent out with the invitations.
St. Paul's Cathedral holds 2,300 people and is expected to be full on the day, Cameron's office said.
Some friends of Thatcher have already said they will be absent.
Former Soviet leader Mikhail Gorbachev is not planning to attend for health reasons, Vladimir Polyakov at the Gorbachev Foundation in Moscow told CNN.
Nancy Reagan, the widow of former U.S. President Ronald Reagan, Thatcher's great political friend and ally, is also unable to attend, a spokeswoman said.
"Mrs. Reagan is heartbroken over Baroness Thatcher's death and would really like to be there in person to pay her respects. Unfortunately, she is no longer able to make that kind of a trip so will not be attending the funeral," she said.
Nancy Reagan has asked Fred Ryan, chairman of the Ronald Reagan Presidential Foundation and a longtime personal friend, to represent her at the service.
Downing Street confirmed that the Argentine ambassador to London had been invited, as have other envoys, in line with protocol. No other Argentine representatives have been invited, however, meaning President Cristina Fernandez de Kirchner will not be there.
Fernandez has stepped up her rhetoric in recent months over the disputed Falkland Islands, known to Argentines as Las Malvinas.
Thatcher waged a short, sharp war with Argentina over the Falklands in 1982 after Argentine forces invaded. The islands, which raise their own taxes but rely on the United Kingdom for defense and foreign policy, have been under British rule since 1833.
Thatcher, who led the Conservative Party from 1975 to 1990 and was prime minister for 11 years, died of a stroke Monday at age 87.
A towering figure in postwar British and global politics, she is remembered in the world for her Cold War-era friendships with Reagan and Gorbachev, as well as her role in shaping Britain's place in Europe and her leadership during the Falklands War.
She was on the wrong side of history when it came to South Africa, however, having opposed economic sanctions against the apartheid regime and described Mandela's Africa National Congress as a terrorist organization.
Mandela and de Klerk jointly won the Nobel Peace Prize in 1993 for their efforts to end apartheid.
Back at home, Thatcher was a highly polarizing figure in British politics.
Police are stepping up security ahead of the funeral, amid concerns that protesters angered by Thatcher's actions in office may take to the streets.
Many Britons blame her for creating soaring unemployment, when she reduced or eliminated many government subsidies to businesses and took on unions. Her battle with striking coal miners won her few friends in mining communities in northern England and Wales.