It’s a little ironic. Just weeks after David Hockney lamented the vanishing bohemian spirit of his youth and complained that gay men have become boring and conservative here I am trying to get across Oxford Street to catch the final day of his exhibition. What’s stopping me is a rainbow-coloured tide of marching, dancing, chanting, strutting, pouting humanity. Gay, lesbian, bi and transsexual. Men and women. They are out and proud and doing their bit to give London 2015 its biggest Pride march yet.