Hi Adam,
Hopefully I can clarify this.
Peter Collins found the first Glaucous Gull at the flats on 23/12/2011. This was colour ringed, and due to a remarkably quick reply from the ringers, we were told it was ringed as a 2nd year bird at the Ugie Estuary , near Peterhead, in Aug 2011. I wrongly put this on the DBC website as a first winter, but it is clearly a 2nd winter bird. Apparantly this is the first Glaucous Gull to be ringed in this country for 9 yrs, and only the 62nd ever. This is its first reported sighting since it was ringed.
Then Peter Collins found another, unringed Glaucous Gull, probably the same age at the flats on Christmas Day. I didn't see that one, as the good lady would have murdered me if i'd even tried to look on Christmas day.
Hope that helps.