Beverley Martyn, a singer-songwriter with a versatile, bluesy voice, who has died aged 79, was a star of the vibrant London folk scene in the late 1960s. She was best known for two albums, Stormbringer! and The Road to Ruin, recorded in 1970 with her then husband, the guitarist John Martyn – after which she had a long absence from the studio while raising a family and trying to deal with the fallout from their troubled marriage. Having arrived in London at the age of 15 from Broad Heath school in Coventry to study drama at the Corona theatre school, Beverley Kutner, as she was then known, had found herself more attracted to singing in Soho folk clubs than to acting, and had turned down an offer from the Royal Shakespeare Company so that she could be a singer. She worked with a jug band, the Levee Breakers, with whom she released a single, Babe I’m Leaving You (1965), when she was 18.…