This is my mother in 1944 or 1945. I never knew she was entitled to wear a medal ribbon. Being black and white, I have to take a guess based on the layout, and I think it may be the Defence Medal but I am puzzled by what seem to be horizontal bars. Has anyone any ideas?
(1) Defence Medal
(2) My mother
(3) Ribbon detail
Those "horizontal bars" are reflected light. Fresh medal ribbon is usually quite glossy, and can give reflections like that. The ribbon is for the Defence Medal.
The Defence Medal was more of a campaign medal than a bravery decoration, and several million were awarded. For UK residents, the qualification was 1,080 days of service in the UK, or 360 days overseas service in areas not subject to air attack or invasion, or 180 days overseas in threatened areas.
Incidentally, the picture is necessarily from 1945. The Defence Medal was not instituted until May 1945, and general issue probably took several months, while the subject was demobilised in late 1945.