Excellent photos - fascinating!
Very impressive detective work Matthew!

What do others think about the best way to post these photos for (possible) identification?
I tend to think that posting in large numbers at the same time can get confusing, and a bit overwhelming, with the likelihood of some photos being overlooked.
How do you prefer to see them posted? One photo per thread (as per Caz and others ID photos)? In "batches" if possible to identify "batches", or just randomly?
It might take a bit of sorting but my preference would be for military ones together in series of 3 to 5, and similar for others catalogued by location?
Alternatively, if the slides were developed in a series which may tell a story, that would be a good way to put together a time line of events. For example in this series, the chap at the front door in his uniform possibly packed up to go off to war, then the same chap appearing in some of the photos taken during his service abroad.

Just my thoughts.

May I ask how many slides/photos you have Joy? They are a joy

to see and I hope we will be able to find interested descendants who will delight in having them returned to the family.