Why did RAF keep using its own Pilot's Notes/manuals when better ones available?

[MW Giles]

Suggested reasons for RAF doing its own manuals

1. The RAF had a standard format, which once you are familiar with it, makes finding the right section easier

2. The aircraft in RAF service were fitted with different kit from their US counterparts

3. British and US units of measurement are different, particularly when it comes to gallons - the US Gal is significantly smaller (20%) than an Imp Gal. Equally boost pressures were measured differently in Hg v psi and tons are not the same either (2000 lbs v 2240lbs).

4. The Americans do not know how to spell properly (color, thru, etc; I ask you) and terms vary airfield v aerodrome, radio v wireless

5. The RAF manuals were written by AM not the manufacturer

Just some suggestions

Martin