Rolls Royce training publication: Merlin

A friend of mine has a 26 page Rolls Royce training document which he is trying to date and is wondering if it has any particular rarity and if so would it be of any interest to a museum or current Merlin operator or restorer? Any ideas please?

Its full title is “Rolls-Royce Aero Engines – Aero Instruction School Technical Notes”. There is Foreword signed by C.L. Hinings, Superintendent, Aero Instruction School which begins:
“This folder of notes is devised to supplement the material on which specific instruction is given to R.A.F. Trainees in the Aero Instruction School, Rolls Royce Limited, Derby. In general, therefore, this Folder does not include many standard items involved in the routine servicing of our Engines…..”
Engines referred to within include Vulture, Merlin I to XII, XX, XXI, Mk. 30, 45, 46 & 47