I heard a rumour that it has also been seen at catcott
Apparently photographed from the hides around midday on Saturday the immature male pics are on Facebook (Somerset nature photography & rspb greylake unofficial). Not identified until he got home & then presumably posted on birdguides by someone else who saw the post. It was no longer around between 4&5pm;, but could still be in the county (or adjoining one…)