On the stork's second day on Unst it went to roost on the cliffs in the late afternoon, and this gave us the opportunity to get close enough to read the ring. After a little effort we had it - 50P9.
It was then off to the internet to track down the bird's origins, and within 24 hours we had an answer. The bird had been ringed in northern Hungary, close to the Slovakian border, in June 2007. Even more interestingly, it had already been sighted on two previous occasions - in SE Hungary, close to the Romanian border, in September 2008, and in the NE of the Netherlands in March 2009.
It was probably first seen in Scotland on 8th May this year, when a Black Stork was seen flying over the Findhorn valley. All the sightings in Scotland are shown on the following Google map.
View Black Stork 50P9 in a larger map