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PX10
Good spot on the lugs, but as far as I know the PX10 doesn't sport the wrap over stays this one shows.
Those wrap over stays are very similar to my Gazelle AB frame, but not the lugs, which are the Nervex Professional used on many bikes with "Professional Racing Feature Cut No. 5" (as http://www.classiclightweights.co.uk/components/nervex.html states).Also, because of, as you noted, cable guides underneath the BB shell, it should be a frame made after the mid eighties, I suppose. So many builders used them for so long!
anidel
@HillyBen
The Colnago looks like a Peugeot PX10 to me. Except for the cable guides. And the Pavey looks like a ruddy Cinelli! But can't be with Zeus dropouts. Red Mercian is amazeballons