Guys thanks for the reply.

when I come back from work I will have a butchers on e-bay for manuals
the aircraft in question has been strips down before (well before my time) and was used in an aeronautical training school/university so sections have been cut out to show working parts, as a practical engineering prospective of how the engine works.

As it was a practical piece, you could turn the props by hand you cant do this any more as its ceased up. a bit rusty looking and needs a face lift.

The engine I will be working on is a Gipsy Queen as to the version, I and a lot of other people know very little of this engine.

(Thankfully) However the building plate is still on it, And it reads as follows
Master control Type Development Alteration Serial No. 2074…..The number 4 could be a 1.

Being that there is a serial number on it. In your view would it be an idea to contact the manufactures if they are still kicking around?

Thanks planemike for the attention to my spelling.
Thanks Stan.