Baroness Thatcher's funeral – codenamed Operation True Blue – is expected to be attended by an array of political heavyweights, past and present and from home and abroad.

Francis Maude, the Cabinet Office Minister, who is co-ordinating the event at St Paul's Cathedral a week today, said: "There is already a huge amount of interest; there's a guest list. People will be invited over the coming days."

Heading the list will be the Queen and Prince Philip; it will be the first time the monarch has been at the funeral of a prime minister since that of Sir Winston Churchill in 1965.

Mr Maude said: "It's very significant that her majesty and the duke wish to attend. Baroness Thatcher was transformational for Britain and also made a huge difference for the world."

The minister chaired a meeting to organise the funeral arrangements. It included members of the Thatcher family, officials from Buckingham Palace and the Foreign Office, and representatives from the Armed Forces and the Metropolitan Police.

Former prime ministers Sir John Major, Tony Blair and Gordon Brown are expected to attend as will many of Lady Thatcher's former Cabinet colleagues from the 1980s. Alex Salmond, the First Minister, will also be there.

The foreign dignitaries could include many who the late premier knew during her time in office – such as Ronald Reagan's widow Nancy; ex-US presidents George Bush and his son George W Bush; Henry Kissinger, a former US secretary of state; Mikhail Gorbachev, former leader of the Soviet Union; Helmut Kohl, the ex-German chancellor, Lech Walesa, the Polish Solidarity leader; and Shimon Peres, the Israeli President.

Mark Thatcher, the late PM's son, was due to return to the UK last night. His sister, Carol, will return before the funeral.

It will take place with full military honours – the same status accorded the Queen Mother and Princess Diana.

The streets will be cleared for a procession taking Lady Thatcher's body from Westminster to St Paul's. Members of the armed services will line the route and flags will be flown at half-mast.

Lady Thatcher will be cremated at a private service.