Hume's Leaf Warbler
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Phylloscopus humei
Rare vagrants from Asia to Britain with 150 records between October-March.
Breeds in Asia & Eastern Siberia.
Similar in size & shape to a Yellow-browed Warbler.
They have greenish upperparts and off-white underparts. With its long supercilium, crown stripe and yellow-margined tertial remiges, it is very similar to the Yellow-browed Warbler (P. inornatus).
However, it has only one prominent light wing bar, just a faint vestige of the second shorter wing bar, and overall duller colours.
It also has a dark lower mandible and legs.
Its song is buzzing and high-pitched.