What started out as Michael Sporn trying to identify a boy in a picture has developed (in the comments) into several lengthy reminiscences of the Dick Williams Studio in Soho Square in 1973. Commenters who were there include Greg Duffell, Suzanne Wilson and Børge Ring.
At the time of the photo, Williams had veteran American animators Ken Harris, Grim Natwick and Art Babbitt working at the studio. Babbit spent weeks teaching classes in animation technique to the Williams crew. The people associated with Williams at this time went on to become leaders of British animation and Dick Williams deserves much credit for providing them with such a singular education.