I have been watching this with some interest,
My late father in law rode an m20 in Burma during 44 and 45.
I have a photo of him sat on the bike with the tank number showing its a 1944 bike and it is fitted with a Talflow filter.
Took me a good while to find one, but i did manage to find a really good original which will adorn my project if it ever gets finished. 😁
I had assumed that there was stocks that just needed using up but it perhaps makes more sense now.
Talfows in Birma are very likely, maybe more likely than Universal cleaners/Vokes.
Contract information states India as ordering entity and that included basically the entire far east.
It may also indicate why the Talfows were not very well known in Europe.