I have a frame that has a lot of the same detailing (though not exactly the same) that consensus here pegged as a Falcon. Thread's here (OP and I traded some frames, that's how I have it now)
http://www.bikeforums.net/showthread...734&highlight=

Mine definitely has two holes vertically disposed for headbadge, fitting the Falcon spacing. The precursor company to Falcon was Coventry Eagle, and their headbadge was different; perhaps with three holes, if I remember correctly. You should measure the hole spacing, and compare it to a Raleigh heron -- I don't think that they changed that, and it's possible that it's not a Raleigh/Carlton at all.

You should also check the brake bolt to dropout distances. On my frame (and many English bikes of that era), the rear needs a brake with larger reach than the Weinmann 610 will provide -- you will probably need a 750 there. Caliper sets are commonly available in 610/750 pairs.