First Minister Alex Salmon has paid tribute to Baroness Thatcher.
– Alex Salmond, Scotland's First Minister
"Margaret Thatcher was a truly formidable prime minister whose policies defined a political generation.
“No doubt there will now be a renewed debate about the impact of that legacy.
“Today, however, the proper reaction should be respect and condolences to her family."
Labour will suspend campaigning in the local elections until further notice following the death of Baroness Thatcher, senior party sources have told the Press Association.
Former PM Tony Blair has paid tribute to Lady Thatcher:
“Margaret Thatcher was a towering political figure.
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.
And some of the changes she made in Britain were, in certain respects at least, retained by the 1997 Labour Government, and came to be implemented by governments around the world.
As a person she was kind and generous spirited and was always immensely supportive to me as Prime Minister although we came from opposite sides of politics.
Even if you disagreed with her as I did on certain issues and occasionally strongly, you could not disrespect her character or her contribution to Britain’s national life.
She will be sadly missed.
In 1982 Argentina invaded the Falklands. Following reports British troops had recaptured the island of South Georgia from Argentina, she told reporters asking questions of her: "Just rejoice at that news."
Anne Widdecombe, former Conservative minister, told ITV News: "She was a very, very determined lady and a great legacy for women because there is an entire generation that, from the time they were five-years-old until the time that they had their first vote, knew nothing except a woman in charge."
Flowers have been left outside Margaret Thatcher's Belgravia home. The card reads:
"RIP Maggie Thatcher.
"The greatest British leader and a true lady.
"You make Britain what it is. Rest in peace."
So sad to hear of the death of Lady Thatcher. The greatest PM of all time who rescued this country and made Britain great again.
Very saddened to hear that our greatest peacetime Prime Minister, Baroness Thathcher, has passed away. She will always be my hero.
Our thoughts today will above all be with Margaret Thatcher's family on their loss. She was a politician of conviction who broke new ground.
terribly sad news that Lady T has passed away. she brought me into politics and remains an inspiration to this day.#fb
Britain was on its knees in the 1970s. Mrs Thatcher saved the country. She was incomparable.
All of us right or left, young or old, owe a huge debt of gratitude 2 Mrs T 4 an unrivalled lifetime of public service who put Britain first