Denny Laine, who has died aged 79, was a singer and guitarist with the Moody Blues before spending the 1970s with Wings, Paul McCartney’s post-Beatles outfit; he featured prominently on two chart-toppers, singing lead vocals on the Moodys’ first big hit, Go Now!, going on to co-write Wings’ Mull of Kintyre, which outsold all The Beatles’ singles.