ID confirmation

[MikeN]

From this morning at Windermere Basin Hamilton. Think this is a female black throated blue warbler, but I have been wrong before...

Thanks as usual

[lovemypt]

yellow-rump warbler....The Black-throated blue have no wing bars, just a very small patch on wing and are more green-ish grey colour, you can see a hint of yellow starting on edge of wing/side