I'm still trying to work out if one of the ED engines is in fact a MK2?
Does it look like in Chris's photo?.........The engine on the far left? The second one from the left with T shaped compression screw is a Competition Special..........Both are 2cc in capacity.
If it is a MK2, I may be interested in it as that model was my first engine in the late '40s. I do have a Comp. Special and a MK2 would be nice to have to go with it and to use in a Free Flight model. PM me if you prefer, and a picture of it would be most helpful please.