Hume's Leaf Warbler Phylloscopus humei
Once treated as a race of Yellow-browed Warbler Phylloscopus inornatus, the name Hume's Yellow-browed Warbler is still sometimes used. Clements and eBird both use the shorter Hume's Warbler while Sibley and Monroe call it Buff-browed Warbler, a name I don't think I've ever heard anyone use.
I'd seen a few of these before but this appears to be the first time I've photographed one.
Hume's Leaf Warbler, Brancaster (Norfolk, UK), 26th December 2022