I can't quite make out the detail, I don't think it is a Talflow filter but would not be at all surprised.
Even though the factory was bombed out in 1941, I have a photo of my late father in law, sat on a 1944 bike, in Burma, with a Talflow filter on it.
It took me a good while to find one, but I did as I am rebuilding mine to replicate his as best I can.
Darren
I think you are indeed correct Ron, It has the hooded lip along the front, I just could not make out the extra bump at the front which was the air scoop.