Please note that all the British infantry sets include two STL versions - either with or without the chest respirators, groundsheets and gas capes worn in 1940, this means they're suitable for use throughout the whole war in the European theatre.
The Mid/Late-war versions wear their canteens, bayonets, entrenching tools and small pack (without groundsheet/cape). They also have more Netted Brodies and Hessian Strips.
These models are natively 6mm-scaled. To print them at 15mm, please scale upright figures to 190% on the X/Y axes and 200% on the Z axis (the zoomed in picture(s) show these altered proportions). Prone figures should be set to 190% on the X/Z axes and 200% on the Y axis.