"James I was incredibly ambitious for London and the monarchy architecturally, " says Thurley.

BBC: The landmark buildings that never were

Other fragments survive under Downing Street, says Simon Thurley of English Heritage.

BBC: The landmark buildings that never were

Dr Simon Thurley, chief executive of English Heritage, said the remains of the Cold War were "fading from view faster than those of the world wars".

BBC: Cold War missile sites get listed status

"Curzon's Bill reintroduced the idea of compulsion, the idea that was originally in Lubbock's act and had be taken out because it was considered intolerable, " says Simon Thurley, chief executive of English Heritage.

BBC: The man who demolished Shakespeare's house