In 1695 he became organist of St Margaret 's , Westminster , and he also took his old job at Westminster Abbey again when Henry Purcell died . In 1687 he became choirmaster at St Paul 's Cathedral ; in 1695 he was elected organist of St Margaret 's , Westminster , and is said to have resumed his post as organist of Westminster Abbey , from which in 1680 he had retired or been dismissed to make way for Purcell .