Thank you Jawmedead
Yes I have spoken with them and they have nothing more than is on the web site.
The AN4 engine is the nearest but where the charb is on the AN4 engine there is a clutch and a two or three speed gearbox on the engine I am trying to identify, so the ancilleries are all different. Also the sump looks different.
It is very similar, that is why I think it may be a Coventry Victor, But I need more conclusive proof.
Many thanks again
Chris Thomas