In reply to Myfyr Tomos:
I think the climber on the left may be G.S.Sansom. Samson, Jeffcoat, Laycock and Herford were great friends and climbed together. Here is a picture from George S. Sansom's Climbing at Wasdale before the First World War (1914), p. 36:
https://bit.ly/2VrzVg2
I have a maddening note on that page, saying the climber back right may be 'E. Pryor'. It has page ref to another book, but I can't decipher my own writing!
So I'm tentatively suggesting: Back: Unknown, Pryor; Front: Sansom, Jeffcoat, Laycock, Herford.
Post edited at 18:05