Jess5athome,
Thanks for looking Fred up but that is too old, Fred was born 1893 Dewsbury, Yorkshire. I have him as F. Jackson, East Yorkshire Regiment but there are other possibilities, it is only based on family's oral history that he "died near end of the war". However they were wrong about another WW2 casualty, "died in a submarine near Brazil" turned out to be torpedoed in HMS Penelope in the Med !
Fred Jackson is a common name, don't think I will ever be 100% sure.
I have attached what I hope is a better photo of Annie's cap badge. Looks like she did more than one photo in that studio session as her blouse and necklace is the same as in the factory uniform .
thanks
Chris