Warbler i.d. from Doi Lang, Thailand (1 Viewer)

These images are of the same individual taken at Doi Lang on 12 Dec 2019. Can anybody identify the species please. We thought Grey-crowned Warbler, but it should have an incomplete eye ring. Perhaps Marten's ?

Did you hear it call?

When these all got split, Craig Robson told me they were best done on call, from memory, Grey-crowned has a single note 'chip' call?

Grey-crowned generally has a break at the rear of the eye-ring, and this bird has too much grey on the head, especially below the lateral crown stripe, for Alstrom's, so i would narrow it down to Bianchi's or Martens's. As Andy says, best done on call, unless you have a shot of the spread tail.

EDIT: Alstrom's not found here according to the checklist.

Shots seem to show extensive white on outermost tail feathers?

Thanks guys. Don't remember a call. Birding there is quite hectic and there is always something else appearing.