The capital's changing skyline could threaten Westminster's world heritage status.
In a meeting next week, Unesco will consider placing the area surrounding parliament on it's "endangered" list in response to plans for a series of skyscrapers.
“Thisnews is very disappointing because UNESCO have threatened to put theWestminster World Heritage Site on their ‘In Danger’ list if the setting of theWorld Heritage Site was not protected from insensitive development.
"It looks like the Government has failed to do this and we will await news from UNESCO. Loss of World Heritage Site status would be very bad news for the country. It would signal that we are failing in our duty to protect our heritage. "
Thatcher's former cabinet minister Norman Tebbit paid an emotional tribute to his old boss and friend in the House of Commons today.
He spoke movingly of the support she provided his family after he and his wife were injured in an IRA bomb attack at the Grand Hotel in Brighton. He praised her courage and popularity, and reflected on her demise, saying:
"I left her, I fear at the mercy of her friends, that I do regret."
Labour leader Ed Miliband praised Baroness Thatcher for "breaking the mould".
“At each stage of her life she broke the mould - a woman at Oxford, when there was no a single woman in the university who held a full professorship.
"A woman chemist when most people assumed scientists had to be men, a woman candidate for Parliament in 1950 against the opposition of some in her party in Dartford at the age of only 24, a woman MP in 1959 when just 4% of MPs in the whole of this House were women."