Thanks for your reaction!
Yes, have been reading today about the 25pdr's development (on the net and in one of Hogg's books). There is no evidence that it was based on the Rheinmetall or Krupp 9cm gun howitzer, but the concept is strikingly similar.
Vickers being a private player and in active contact with Krupp (they also bought new fuses from Krupp in 1926 during the famous settlement and in the end paid suspiciously little money for the wartime patents), would still not rule out that at least they knew about the concept of the German weapon.
The 25dr's carriage came from the Vickers 4.1 inch howitzer to be precise, that still had a screw breech. There had been several different designs of various calibers and ditto Army demands from the early 20s to the mid 30s. It is also interesting that the Brits were actually thinking in these "continental" calibers of 75 and 105mm
As an aside: the postwar Dutch Army knew the 25pdr as the 9 Veld, while the Portuguese called it their 88
Later Cockerill of Belgium updated the 25pdr by placing a 105mm barrel on the carriage that decades ago was designed for a 105mm weapon!Good weekend!
