May announced her first big shake-up just minutes after entering Downing Street on Wednesday.
The report claims it will take another six months before the government decides precisely what it wants to achieve from Brexit
Five people who died in the blaze have been identified and 74 were missing and presumed dead.
The MPs voted in favour of the Queen's Speech by 323 votes to 309 with a majority of 14.
He was arrested by Swiss authorities for trespassing at the event in July 2015 but later released.
Johnson, the former foreign secretary, secured 92,153 votes against 46,656 of his rival Jeremy Hunt in the battle for 10 Downing Street.
Johnson becomes the 14th Prime Minister to be appointed by Queen Elizabeth II, the 55th to hold the post of British PM and the third in fairly quick succession since Britain voted to leave the EU in June 2016 - following on from David Cameron and Theresa May.
Newly re-elected British Prime Minister David Cameron is working out his first one-party Cabinet made up of Conservative party MPs without any Liberal Democrat coalition considerations of the past.