[Lynn Eades]

Alistair, go to Nigel Watsons vol 1. pages 210 (pre U.C. and U.C.) and page 211 for Loyd engines.
The No.3 engines were the 90 H.P. engines.(see below)
The EGAE and EGAEA appear to be 85 H.P. (American origin)
The Canadian Engines ( COIUC) were the 90 H.P.
British origin engines were: Variously prefixed:SE51,79E,79F, along with suffixes.
Some British engines wore American ancillaries and generally had 18mm spark plugs while the North American engines used 14mm plugs.
There looks to be about 15 variations across the northern hemisphere war time carriers.
Thanks again to Nigel.