Grilling phylloscs

Early morning had me trying to get good views of another phyllosc at the Ministry of Public Relations, but the hyperactive little bugger was really giving me a headache. Either and Arctic or a Two-barred Greenish, watching it in strong sunlight made the plumage tones look really quite yellow and green (not the subdued olives I am used to seeing in Arctics, but most of those I have seen recently have been in areas of heavy shade). With such brief views and the bird not calling I was left undecided.  2BGW passes through Bangkok in small numbers, especially in autumn, but it's not something I have seen on either in my two local birding areas, so I'm very keen to score an indisputable bird.