Yes I believe tuere were some 18pdrs mixed with the 25pdr conversions.
There seems to be some confusion, as some references qoute 18/25pdr.
Most of the 18pdrs I have photos of show the Martin Parry conversion to pneumatic tyres.
If you have a reference or better still a photo of a split trail gun captured in France, I would love to see it. I know they were in service with the RA and some Territorial units.
The "Irish" split trail, was photographed at Curragh military exhibition, I downloaded it from a web site that I cannot recall, and I have been trying to track down the owner without luck. Hoefully someone out there will know who owns it.
Send me an email and I will get back to you, though I only have a couple mre shots, but they might be of use.
I photographed and measured the box trail version at Woolwich, the Rotunda I believe has other guns, but is not open to the public as far as I know.
I thought all of those exhibits were now at Woolwich, Firepower Museum.
I noticed that the "suspension" did not seem original, as the rear section should have rubber gaiters. The box trail version had limited traverse, and the carriage could "rotate" about the axletree. The gun itself has an inner shield, that moved with the carriage, the outer shield and axletree remained stationary. (clear as mud).
One interesting thing though, the museum did have the drawings of the experimental 4 wheel version. These drawings were copies of the blueprints, and very well detailed.
As I said guys, email me
george.dfs@virgin.net if I can be of help.
Cheers.
George.