Phylloscopus?

Went back to try to relocate the warbler but it had moved on. All available evidence points at Sakhalin leaf warbler, which is nice. A few more to add to the year list while there, mainly by keeping eyes to the skies for flyovers which produced grey-rumped treeswift, Brahminy kite and red-rumped swallow. Meanwhile, colour was provided by a pair of collared kingfishers busy setting up a nest and a special offer of two for the price of one on dollarbirds. Why are they called dollarbirds? Answers on a postcard to the usual address.