Black and white.
The caption reads 'CAR Crosland (Sec to the Commission), Dr JE Jefferys, Miss M Digby, Prof DT Jack, H Gaitskell MP, SJL Hardie, FC Pettie, J Murray'. 'FJL Hardie' is presumably as misprint for 'SJL Hardie', who was a member of the Commission.
A reference code on the reverse reads 2842/17.
A stamp on the reverse states that the photograph is by Reynolds News, London.