In response to Mike Y-P's comments, the Pembrokeshire Avifauna entry on the origin of UK Snow Buntings is based on the information contained in both The Birds of the Western Palearctic and the BTO's Migration Atlas. The problems involved in assessing proportions of the races is discussed in the latter publication, which makes a request for more ringing of the species in western Britain.
Keep at it Mike, there is no reason why Greenland birds should not occur in Pembs as well as Icelandic, indeed Canadian birds have reached the UK as well. Look forward to further observations and thoughts.
Graham Rees
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