The guessing is over. The photo was taken by David Redfer who is from London.
From the joint gig by the Max Roach Quintet with Sonny Rollins in Reading, England, and broadcast by the BBC as part of their "Jazz Goes to College Series". Personnel is: Sonny Rollins, tenor sax; Freddie Hubbard, trumpet; Ronnie Mathews, piano; Jymie Merritt, acoustic double bass; Max Roach, drums. Date would be November 6, 1966.
Given that Rollins and Roach were leaders of their own groups, and since many musicians traveled to Reading from London to attend the gig, it may have been a one-off.