Downing Street has released an initial list of invitations to Baroness Thatcher’s funeral next Wednesday.
All surviving US presidents and British prime ministers are on the guest list, as well as a representative of the Reagan family.
Ronald Reagan’s widow Nancy is understood to be too frail to travel.
Former Soviet leader Mikhail Gorbachev will also not be attending owing to health problems, his spokesman has said.
The guest list for the event was drawn up by Lady Thatcher’s family with the assistance of the government and the Conservative Party.
More than 2,000 invitations will be sent out, with most set to be dispatched on Friday.