Snow B's etc

The etc was a Red Kite at Sealyham and a Water Rail running across the road nr Penberi. The Golden Plovers and Lapwings still along the Glascrug rd, day- roosting at Cwmwdig Fm entrance a lot of the time, conditions and circumstances yet to allow a good grilling. The Snow Buntings were out at St Davids Hd, nr the Burial Chamber. Both seemed to be adult males, very bright and showy in the sunlight. The plumage variation was extreme, one bird was quite well marked foxy red on 'cheeks' and breast sides whereas the other was strikingly different; very pale and bright but lacking the contrasting brown markings. The reason is presumably just normal individual variation but I remembered that the Siberian race is paler and just wondered if we know that ours are Icelandic/Greenland birds or (less likely) Scandinavian in origin (but then with more possibility of further eastern birds). There are lots of colour ringed birds in east-coast flocks so presumably their origin is known - but I can't remember what it is even though I've sent off lots of records of these. I was surprised that the provenance of Snow B's in Pembs or Wales isn't mentioned in either of Jon Green's books and wonder if anyone (ringers?) can illuminate. Postscript - The new Pembs Avifauna says most British birds are Icelandic ('Insulae') with a smaller number of the nominate race 'nivalis' (Greenland certainly and I presume Scandinavia though it doesn't say). Still leaves a few questions particularly regarding our birds. Just to say - BWP says that Snow B's have an extended period of Autumn Migration shifting into December and today I notice a number reported on Birdguides from various east and west British sites. Leaving hurricanes in Scotland aside of course.