Photo 1, was that the solversmiths guild? A gathering of trophy makers/artisans formed together for war work. A bit like United Instruments and Houghton Butcher who got all the local bit part instrument makers for the local works, such as Vickers, CTS in York and HBM in London together.
Looks like that lady has didn't know how to put the sling on properly for the photo shoot. Coiled the loop into the butt somehow and is just holding the loop end ......somehow! It's a very early Mk1 non adjustable type too.....