We came across this video of a New Musical Express concert in 1965. It’s not all blues but there are some great examples of 1960’s British bands doing blues covers.
Performers, in order of appearance are the Moody Blues (pre- Justin Hayward and John Lodge, when they were doing blues covers like Bo Diddley), Freddy and the Dreamers, Georgie Fame (covering Rufus Thomas‘ Walking The Dog), The Seekers, Herman’s Hermits, The Ivy League,