This is the only Treecreeper I have ever caught at Buckton in 9 years of ringing, caught in fall conditions on October 20th 2002. It was a particularly white and pale washed out brown individual with a broad white supercillium. Buckton is no place for a Treecreeper and this individual does not fit the pattern of post breeding dispersal which takes place in July-August, so there must be a very high possibility it was of Scandinavian origin but short of a ringing recovery how do you prove that?
Above top, this was a first winter female Northern Bullfinch caught at Buckton on October 22nd 2004, the bird had a wing length of 90-91mm - see middle image, well out of the range of the resident British race (P.p.pileata) of Bullfinch which has a wing max length of 84mm. Note the white wing outer primary edges in P3-5, I found this pattern to be identical to several Bullfinches I handled in Kiruna, Northern Sweden in January 2006 - see the male above. I have never seen this primary pattern in any pileata Bullfinches I have caught.
This Lesser Whitethroat was caught and ringed at Buckton on October 11th 2004. It was very sandy brown backed and had a particularly short wing, a great candidate for a bird of Central Asian origin, but how can that be proved ?