Jake Robbins from Elk Engineering in the U.K very kindly supplied me with a fork I.D
The forks are called 'Val Page' forks, and are from the 30's. They were only fitted to a few machines and for a short period of time.
Val Page moved from Ariel to Triumph Motorcycles in 1932, and with Edward Turner developed the pre-unit parallel twin that we know today.
Girder photos below...