Thanks everyone for sharing their stories. It's really good to know that information like this is getting passed down through the generations. I'm so glad that I've heard stories from my grandparents' generation, but unfortunately I've heard very few stories from the previous generation, i.e. my great-grandparents.
I have two sets of great-grandparents that married shortly after WW1, but no information about how they met. One couple both grew up in the same small town and married in 1919, so I suspect that their paths may have crossed even if the war hadn't happened.
The couple I'm most curious about married in 1919 - he came from a farming family in Shropshire, she came from an industrial area of the West Midlands, not too many miles away as the crow flies. His brothers all married local girls. I have no information about what he did during the war - no army records found, and no stories passed down through the generations - so I wonder if the war played some part in him spending time away from the farm and meeting his future wife in her home town.