Radiohead deliver a spell-binding, hit-packed set in London

Mark SavageMusic correspondentAlex Lake / @twoshortdays"We are Radiohead. Pleased to meet you," said Thom Yorke in one of his few addresses to the audience"Whenever you're ready," says Thom Yorke, adopting the tone of a schoolteacher waiting for an unruly class to settle down, as Radiohead get ready to play their encore at London's O2 Arena.It's a rare flash of humour from the frontman, whose onstage utterings…