Acro confusion:

A few photo's I had of an acro at Whitby yesterday. It fed almost exclusively in long grass and low bramble, only occasionally popping up into low branches of elderberries. I watched it on and off for nearly two hours, and still not really sure what species it is. It didn't have a tail, which didn't really help.

FWIW, I think the photo's make it look a little warmer than it was in the field, adding more brown tones. They are unedited. I should add i was veering towards Blyth's in the field, but the tertials are worrying me.