Having scraped most of the paint off, there only seem to be Enfield markings on the exterior. Some of the internals are also Enfield marked. It cost £10 as the dealer claimed in was ex-Chindit. A likely tale, but I didn't quibble as I had my eyes on the greater prize...
Were the Boys cartridge cases the ones covered in grot that were £10 for 5 with a charger? I bought a rusty WWI Mills No.36 drill grenade as a 'have fun restoring it' project.