The Prime Minister told Conservatives from the South: 'Stick with it and let's finish the job'. He was speaking on the final day of the Tory conference in Manchester. Our political reporter Phil Hornby was in the hall, listening to Mr Cameron's speech.
Cabinet Office Minister Francis Maude, the man responsible for organising Thatcher's funeral, said the costs are a "fraction" of the figures being "banded around".
Speaking to Daybreak he said: "The state will always pay for the costs of the funeral and memorial of a former Prime Minister and Margaret Thatcher was very adamant she did not want to have a separate memorial service.
"So this is the one occasion when people will get their chance to pay their respects, give her a send off and commemorate what was, by any exception, a really remarkable life."
The Queen personally decided to attend Lady Thatcher's funeral. This will be the first funeral of a Prime Minister she will attend since Winston Churchill's.
Lord Tebbit, who was badly injured during the Brighton bombing, pays tribute to Mrs Thatcher.
Liam Fox, former secretary of state for defence, has said that Margaret Thatcher was always "full of energy", and has spoken about when she recently attended his birthday party.
Deputy Prime Minister Nick Clegg has paid tribute to Margaret Thatcher during a visit to Penzance in Cornwall.
He said that the former prime minister was "one of the defining figures of modern British politics".
Former member of Margaret Thatcher's Cabinet Lord Douglas Hurd has spoken of his fondest memory of the Conservative prime minister being during a trip to Paris while she was fighting for her political life against Michael Heseltine.
"She swept in to the bug Galerie de Glace at Versaille and she carried herself like a queen. She was amazing - showed all the courage which I will always remember her for."
Speaking about Baroness Thatcher's legacy Lord Hurd said:
"It'll take some time for people to fit her in to British history...she'll find her place in history."
The funeral of former prime minister Baroness Thatcher will be held on Wednesday April 17, David Cameron saidRead the full story ›
Ed Miliband has reacted to the death of Baroness Thatcher, saying that personal views are irrelevant when recognising "an extraordinary politician and unique political figure."