Britons will have the opportunity to bid farewell to Margaret Thatcher in London next week.
British officials are preparing for the ceremonial funeral at St. Paul's Cathedral with military honors, to be followed by a private cremation. A ceremonial funeral is one notch below a state funeral and was approved by Queen Elizabeth II.
Thatcher, Britain's first female prime minister, died Monday at age 87 after suffering stroke, her former spokesman said.
Flags at Buckingham Palace, Parliament and across the United Kingdom were lowered to half-staff, and Buckingham Palace said Queen Elizabeth II would send a private message of sympathy to the Thatcher family.
For admirers, Thatcher was a savior who rescued Britain from ruin and laid the groundwork for an extraordinary economic renaissance. For critics, she was a heartless tyrant who ushered in an era of greed that kicked the weak out onto the streets and let the rich become filthy rich.
"Let us not kid ourselves. She was a very divisive figure," said Bernard Ingham, Thatcher's press secretary for her entire term. "She was a real toughie. She was a patriot with a great love for this country, and she raised the standing of Britain abroad."
Prime Minister David Cameron cut short his trip to Spain and canceled a visit to France to return to London for the funeral preparations.
"As our first woman prime minister, Margaret Thatcher succeeded against all the odds," Cameron said in Madrid.
"The real thing about Margaret Thatcher is that she didn't just lead our country. She saved our country," Cameron said, "and I believe she'll go down as the greatest British peacetime prime minister."
Former Prime Minister Tony Blair, who ousted the Conservative Party from power seven years after Thatcher's resignation, conceded that Thatcher had been right to challenge labor union power -- the traditional bedrock for Blair's own Labour Party.
"Very few leaders get to change not only the political landscape of their country but of the world. Margaret was such a leader. Her global impact was vast," said Blair, who credited Thatcher with being "immensely supportive" despite their opposing views on many issues.
"You could not disrespect her character or her contribution to Britain's national life," Blair said.
Not all Britons agreed. Several hundred people gathered in Glasgow and in London's Brixton neighborhood for impromptu celebrations, complete with party hats and streamers.
The National Union of Miners -- which tussled with Thatcher in a long 1984-85 strike, and lost -- expressed condolences to Thatcher's family, but said: "The damage caused by her fatally flawed politics sadly lingers on. Good Riddance."