When did you last hear of a poetry book selling in the millions? Well, since 1958 when John Betjeman's Collected Poems was first published, sales have exceeded 2.5 million and are still going strong. When he died in 1984, still as Poet Laureate, he was by far the UK's favourite poet (as Philip Larkin acknowledged). Thanks to his work as a broadcaster and architectural campaigner he was also a celebrity. However his life was full of insecurities, frustrations...