Black and white.
The caption reads The Rt. Hon. Hugh Gaitskell, M.P., C.B.E., looking very pleased with the hat he has just purchased at the R.A.C.S. Departmental Store, Bexleyheath. Obviously delighted is Mrs Gaitskell, who accompanied him on the visit to the Store.'
A reference code on the reverse reads T/B.9987.
A stamp on the reverse states that it is by Pace, Kent.