Although it looks a bit large in the pictures, i can't really see why its not a Pallas's Warbler. The prominent pale tertial fringes are not found on either Blyth's or White-tailed as far as i can remember, and you would be able to see the white outer tail feathers on at least one of these pictures.
I agree with Frenchy - looks like a rather dull Pallas' to me too - also I don't think there are records of White-tailed Leaf Warbler from Zhejiang, and especially in winter all records of resident White-tailed Leaf Warbler in China are more westerly, I think.
White-tailed was recorded by La Touche in Eastern China in the 1930s and the race ogilviegranti is supposed to occur at Wuyi Shan. However this is a very difficult species in taxonomic terms - there is another race - disturbans - which obviously gave La Touche, who was a top class taxonomist, severe headaches!
amongst other things, it has pale-tipped dark tertials (like YBr and Pallas's etc) and the secondaries aren't right either. It's also very pale below and has dark-centred greater covs and a shadow below the greater covs etc. The wing just doesn't look right for a Blyth's / White-tailed type
It's a posh bloke Paul called William Robert Ogilvie-Grant (1863-1924). He was curator of birds at the British Museum. Apparently he originally just called himself Grant but for some reason changed to Ogilvie-Grant around 1902.