Argentina has brushed off its snub over Margaret Thatcher's funeral, branding it "just another provocation".
Foreign Minister Hector Timerman said: "It does not matter to me to be invited to a place where I don't want to go," Reuters reported.
He added "It is another provocation. The woman died, let the family mourn her in peace".
It was reported that the former Prime Minister's family had made a special request that no representative of the Argentine government would be invited.
Timerman also dismissed calls for Port Stanley, capital of the Falkland Islands, to be renamed after the Iron Lady.
"I don't care if they want to call it Port Margaret, Margarita or Margarona, neither Argentina or the United Nations recognise it," he reportedly added.
Downing Street said the decision to invite the Argentine ambassador, rather than the country's President, Cristina Fernandez de Kirchner, was in line with protocol.
Other guests include F.W. de Klerk, the last president of apartheid-era South Africa, Top Gear host Jeremy Clarkson and singer Dame Shirley Bassey.
Tony Blair and George Bush are also invited, along with surviving members of the Thatcher government.