[Graham Boak]

You can forget anything after mid-May 1940, as Richey was out of the battle from then, and so were fixed-pitch propellors and (with rare exception) fabric-covered wings.

His aircraft will have had underwing roundels because they were required of 1 and 73 Squadrons, as part of the Advanced Air Striking Force.

If you can find references to other aircraft of adjacent serials, see if they had retained Aluminium under the fuselage or not. Even so, there's nothing to prevent Richey's machine being different. Personally I would assume that the retention of Aluminium was only on early aircraft, and that the clarification to full underside black/white was early enough to have seen any examples still in squadron service repainted to match. This does not mean that they necessarily were.