The downloaded file notes "Also these styles were supplied to the princely States and also individual Trading companies in India for sale etc.". I have often wondered about the origin of the tulwar shown in the 1926-27 catalog from Manton & Co. of Calcutta and Delhi:

This appears to provide a partial answer. The same catalog contains the cryptic entry: "Nepalese Kookries made to our special order, various sizes". As Wilkinson undertook manufacture of the 1951 marked Wilkinson Mk IV Kukris, I wonder if Mr. Wilkinson-Latham has found any reference to older British made kukris of the sort mentioned in the Manton catalog?