sry no. You might be able to use the very bottom 1/2" of a .30/06 or SB .308 die for neck sizing. This is rather precarious but can work, after a fashion.
I've done this with wildcats just to make up shoot-able rounds for fireforming to send out to have dies made.
A .460 WTBY sizer (shortened) might work for neck sizing this very slightly bottle-necked case.

Was just thinking a .450 Alaskan set of dies might work, but the British case is likely of very thin neck and perhaps CH4D dies might not have a tight enough neck to work. I have had difficulty getting them to make dies fitting the cases I send, IF they do not match their 'standard' idea of that wildcat.