Some identification information
The bottom bracket cable routing is indeed unusual, and I believe its from a repaint - NOT original. Someone has disassembled a campagnolo bottom bracket routing clip and brazed it onto your bottom bracket. Those are NOT campagnolo BB routing braze-ons, it's a kluge, unfortunately.
If the seatstay wrapover stays taper to a point and meet at the top of the seat lug, and if you have a davis crown, then this bike would match my 1967 raleigh / carlton competition (USA model, in the USA carltons were imported with raleigh livery). The Davis crown would be very light, and if you lay the fork flat on the table the crown has a |E look to it, with the 'E' in a curvey shape and the '|' a solid slash across the top of the crown.
Best wishes and good luck!