[AndyMa]

Thanks to all for the extra information on those Blenheims. I had actually looked at a lot of sources before concluding that #1 was R3602 and #3 was L9332. As we all know research is a never-ending thing, and some of the older sources, although compiled at the time with the best information available, are now being overtaken in the light of further research.
I will try to list my reasoning in future if there is likely to be any doubt about my findings!
Stig, yes, quite correct, Greek is obviously not my strong point. Delta 173 it is.
Cheers,
Andy