I'm not sure these are British troops or, if so, that the period is WW2.
The tunics with pleated pockets and shiny buttons, the leather belts, and the thin cross-strap on the revolver holster don't look right to me for the period, not does the small "purse" (ammunition pouch?) on the belt with the revolver.
Happy to be corrected by our resident experts, but I wonder if these are pre-war uniforms, or possibly, Allied troops ? Polish comes to mind but I am not sure why !

Maec