I'm in no way an expert on wedding dresses, but that looks quite an ornate one for wartime. Maybe a hand-me-down?
Does the groom also have a badge on his left upper arm, or is it a bit of the veil? And what do you know of your husband's uncle's war service - we could possibly say whether it's consistent with the uniform here.
Other than that, who was the photographer, and do you have the dates they were working?
Assuming they're no longer alive, what were the couple's names and dates of birth? Did they have any children, and do you know anything about where they lived and where and when they died? I'm thinking that if one of the names was misspelled at registration, anything that refers to the surnames, or both of the couple together, might help in tracking the marriage down. Church of England marriages are registered at the time of the ceremony, so it would be very unusual for them not to be in the index at all.
Sorry for all the questions - just trying to think of anything that doesn't involve a trip to LMA.
