Here’s something I found in the List of Changes (LoC), a comprehensive list of equipment issued to British forces from the 1880’s until NATO cataloguing and stock-numbers took over in the 1950’s. The pages are from the 1917 volume and relate to the issue, following the acceptance of sealed patterns for the cartridges, chargers and packaging, of 0.256" Arisaka ammunition.
My apologies for the distortion in the copies, the volume was tightly bound and couldn’t be opened full.
Here are examples of the MkI and MkII British Arisaka chargers;
There were a number of different makers for the MkI charger, but the MkII seems to have only been made by Hinks Wells.