LONDON (Reuters) – London fashion designers take up the baton for Britain on Friday, strutting the global stage in a capital city that has already captivated millions around the world with the Olympics, Queen Elizabeth’s diamond jubilee and last year’s royal wedding. Just a few short weeks after a closing Olympic ceremony which put fashion at the heart of a glittering show celebrating the best of Britain in front of the world, buyers, journalists celebrities and models have begun to descend on London fresh from New York and on the way to collections in Milan and Paris. …