Quote:
Originally Posted by cheesehawk
From what I've read, by November 41 all Merlin engines had been fitted with the orifice, interesting about no Merlin IIIs having it, as I would have assumed there were still planes with the earlier engines flying about.
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How many Merlin III aircraft were in the fronline service in November 1941?

I will check the 'Merlin in perspective' for more information, but as it has been said, this is quite irrelevant for BoB era anyway.
As for British effort - they actually obtained the German FI before BoB (apparently from Spain) but didn't consider it important at all:
"In May, 1940, for example, a mysterious stranger approached Michael Golovine of Rolls-Royce an a Budapest cafe, and handed him a parcel containing the fuel pump from a DB601 engine, the device which allowed the Bf 109 to bunt without its engine cutting out. When Golovine tried to give the injection unit to the British Air Attache, he said he did not want it, and it never got to England."