The cable-guide braze-ons on down tube were fairly commonplace for any bike intended to use bar-end controls (barcons) so nothing that unusual on a frame with long DOs and cable clips, etc. Does sort of indicate this may have been a semi-custom build for a customer that specified what components they were using. Many Brit builders would do that including Holdsworthy (who also very occasionally did use Nervex pro lugs but AFAIK not an EDA BB shell). This may never get an exact ID but OP could try sending it to somebody like Norris Lockley or Hillary Stone...maybe best to join and enquire thru the Classic Rendezvous "List" (a Google group, free to join) Also agreed that having recessed bolts for both F&R brakes IS a bit unusual for a frame that appears to early for thi, BUT let's see a pic of that brake bridge (and the 2 may have been drilled out after-market or it's more evidence of a "custom build")
Last edited by unworthy1; 06-27-19 at 09:10 AM.