It only called once when I was there but was an obvious Hume's call. The plumage was very dull with a greyish green upperparts, dark legs, pale underparts, pale wingbar with a hint of a front wingbar, pale supercilium and grey ear coverts.
This bird represents my 3rd in the UK and my 2nd this year. This was my 2nd in Sussex, both at this location.
some very poor pictures in very poor light of the
Hume's Warbler.