For sure the same bird which was first seen in Sweden, end of Mai, and later on moved to Norway, now on its way back south. This is based on the two generations secondaries. Behaves wild, so most likely one of the better records in North West Europe.
Same bird seen in Skagen earlier on 18/7 and the evening before. Presumed same bird as in Skagen on 25-26/5 and on Helgoland (Germany) 28/5-13/6. Associated with a colony of Kittiwakes for 1,5 hours before flying of SW! See more photos and some video on my blog BirdingNJ!