Mark Thatcher says his mother would be "humbled" by the presence of The Queen at her funeral.
He added: "I would like to say how enormously proud and equally grateful we are that Her Majesty has agreed to attend the ceremony next week in St Paul’s and I know my mother would be greatly honoured as well as humbled by her presence."
Sir Mark Thatcher said his mother Baroness Thatcher would be "greatly honoured as well as humbled" by the Queen's presence at her funeral next week.
Green Party MP Caroline Lucas said she would prefer to spend time in Brighton than pay tribute to Baroness Thatcher.
The Labour MP for Rotherham Sarah Champion said Thatcherism "tried to destroy our town".
Members of Parliament travelling back to the UK from overseas to pay tribute to Baroness Thatcher can claim up to £3,750 in travel expenses, it was confirmed today.
MPs are able to claim for their journeys back following the recall of Parliament during the Easter recess, the Independent Parliamentary Standards Authority (Ipsa) says.
The man who provided police protection to Lady Thatcher, Bob Milton, said the biggest risk to the former Prime Minister's funeral is the "lone individual".
He said opportunists could use the day to "mark their hatred" for the former Conservative leader.
MPs and peers will today pay tribute to Baroness Thatcher after her death on Monday aged 87, after a stroke.
On the death of previous Prime Ministers, the Commons has marked the occasion with relatively brief adjournment debates - not a Government motion as tabled today.
When Edward Heath died in July 2005, MPs paid tribute for 63 minutes on an adjournment debate.
Thoughts + prayers of all Americans w Lady Thatcher's family + British people - a towering figure in British life who will be missed by many
Sinn Fein leader Gerry Adams has criticised Lady Thatcher, saying "her Irish policy failed miserably":
Margaret Thatcher did great hurt to the Irish and British people during her time as British Prime Minister.
Working class communities were devastated in Britain because of her policies.
Her role in international affairs was equally belligerent whether in support of the Chilean dictator Pinochet, her opposition to sanctions against apartheid South Africa; and her support for the Khmer Rouge.
Here in Ireland her espousal of old draconian militaristic policies prolonged the war and caused great suffering.
Margaret Thatcher will be especially remembered for her shameful role during the epic hunger strikes of 1980 and ’81.
Her Irish policy failed miserably.
Former Number 10 spin chief Alastair Campbell wrote on Twitter:
disagreed with much she did but Mrs Thatcher was one hell of a PM to cover as a journalist, and one of small number of real change PMs
Former US President George Bush paid tribute to former Prime Minister Margaret Thatcher, saying she was an "inspirational leader" and a "great example of strength and character."
Laura and I are saddened by the death of Baroness Margaret Thatcher. She was an inspirational leader who stood on principle and guided her nation with confidence and clarity.
Prime Minister Thatcher is a great example of strength and character, and a great ally who strengthened the special relationship between the United Kingdom and the United States.
Laura and I join the people of Great Britain in remembering the life and leadership of this strong woman and friend.