That St Davids Subalpine Warbler

Having talked to Ken Thomas about the Subalp seen on St Davids Head on 13th of April, I was more than keen to see the photos and he kindly brought them around today. It looks really good for an adult male Eastern to me (a BBRC bird and likely split). I've posted the sharpest photo below and all the photos with a discussion of the id can be found on mikesbirdnotes blog.