The elevation of Boris Johnson to the Prime Ministership of Great Britain has been greeted with elation in some quarters, with undisguised horror in others.Elected by members of his own party, not by the people, Britain's 77th Prime Minister has ridden into office on the back of the big bold promise to deliver Brexit come hell or highwater and the stakes couldn't be higher.The ABC's chief foreign correspondent and former long-time Europe correspondent, Philip Williams, reports on the rise of Boris Johnson.