As promised we have news from Denmark where Thomas Heincke has found a large flock of our birds and was able to to read many of the collars codes which confirmed they were the Slamannan flock.
There is still some work to collate the information and if anything of further interest is found I will let you know.
We have analysed the weather patters on the 16th and 17th February and reckon that the air flow on both days gave the birds the opportunity to move east and cross the north sea. (see below)
Weather maps courtesy of http://earth.nullschool.net.