Stanley Johnson, the father of London Mayor Boris, told ITV News he was "absolutely thrilled" that his son Jo has been added to David Cameron's team in Downing Street.
He said: "I'm absolutely thrilled at this wonderful appointment David Cameron has made, there is no doubting Jo's intelligence.
"He is delighted and I'm confident the Tories will get their act together in a big way.
"I wish my father had been alive to see this and I'll keep lobbying him to make sure the Tories stay green."
David Cameron has tweeted a picture of his new policy board, which features London Mayor Boris Johnson's younger brother Jo.
The Prime Minister's tweet said: "I've been meeting with my new policy board, made up of MPs. I told them I want more ideas to help hardworking people."
The Daily Telegraph's political correspondent Peter Dominiczak has tweeted London Mayor Boris Johnson's reaction to his brother Jo heading up a Policy Unit in Downing Street.
Boris on his brother's promotion : "Great there is finally a Johnson in Number 10. Jo will be superb. Now for Rachel and Leo!"
The eight pall-bearers who carried the casket into the Cathedral were drawn from Army units, Royal Navy ships and RAF stations with links to the Falklands war, commanded by Major Nick Mott of the Welsh Guards who served in the 1982 conflict.
Lady Thatcher's grandchildren Michael and Amanda walked ahead of the coffin as it entered the cathedral, carrying cushions bearing the insignia of the Order of the Garter and Order of Merit, which were laid on the altar.
Conservative MPs Conor Burns and Andrew Percy were among those who took part in a service for Lady Thatcher inside a chapel in Parliament ahead of tomorrow's funeral:
Very short, dignified, moving service to welcome Lady T's remains to the Crypt Chapel in the House of Commons. Very intimate
Attended the moving service in the crypt of the House of Commons to welcome Lady Thatcher's body. Short, intimate and dignified service.
Tube drivers are to vote on industrial action in a row about working conditions.
The announcement has come as Conservatives on the London Assembly called for curbs on strikes on the Underground.
The union organising the ballot called that an attack on fundamental rights.
Rags Martel reports.
Mick Cash, from the RMT Union, says that he does not believe that Londoners want fundamental freedoms - such as the right to strike - to be eroded.
The RMT union said that it was holding a strike ballot "in response to London Underground riding roughshod over agreements and abusing a range of agreed policies and procedures".
They are unhappy with plans to split a depot in Acton Town into two - claiming that that tube bosses are "ripping up rosters and booking times" and "refusing perfectly reasonable requests for decent staff facilities".
RMT General Secretary Bob Crow said:
"Driver and instructor members on the Piccadilly Line are furious at this unilateral attack by the company on working conditions, agreements and procedures and we are moving forwards with plans for a ballot for strike action.
"We will of course be in talks with our sister drivers union ASLEF and London Underground should be in no doubt about the unions determination to protect working conditions and to stop the abuse of procedures."