It is a rare event that the United Kingdom changes Prime Minister, even rarer that it happens with out the incumbent Prime Minister losing a general election but today will see one such occurrence. After taking questions for the final time it is expected David Cameron will go to Buckingham Palace and tender his resignation to Her Majesty the Queen. A short while later Theresa May will go to the Palace , be appointed Prime Minister and be invited to form a new government.
Meanwhile back at the Palace of Westminster in the House of Commons there will be the first of two days debate on The Iraq Inquiry also known as the Chilcot Report. With some 12 volumes and over two million words you can read it all here http://www.iraqinquiry.org.uk/