My guess would be Phylloscopus trochilus, the willow warbler, but I'm not ruling out common chiffchaff.
Warblers are best identified by sound, as well as behavior (chiffchaffs like to waggle their tail, willow warblers don't). The bird on this photo does have quite an obvious supercilium, which points towards willow warbler. Leg colour is another indicator but hard to judge from this picture alone.
But without having heard the sound, or watching its movements, I would not dare to say for sure which species this is.
@ralph fair enough, thanks. Yeah the sound is annoying because it was about a week ago now so I can't remember its sound, otherwise I could probably identify it myself. I was torn between Chiffchaff, Willow Warbler, or a very striking Cetti's, but I think you're probably right.
@olhl.animal.photography defenitely not a Cetti. Not only does it look different, you're very unlikely to see one of those out in the open like that.
A third option would be wood warbler (Phylloscopus sibilatrix), which is usually more greenish than the other two, as well as a lot rarer. I'm not familiar enough with this species to rule it out completely, but I would say it's very unlikely.
I would say a chiffchaff. A far more frequent bird at Burton Mere than willow warbler though I have heard both on numerous occasions. Sure enough as I write this post I can hear my resident chiffchaff
It's certainly not a Cetti's for the reasons @ralph has pointed out and it is also not a wood warbler due to it not being nearly bright enough. The location is also not ideal wood warbler habitat either.
What other species did you manage at Burton @olhl.animal.photography ? Anything brand new for you?
@Prochilodus246 nothing new this time, just saw Cettis, Reed, and Sedge Warblers, plus various waders including Spotted Redshank, which was nice. On my first visit last year I did see my first Curlew Sandpiper and Ruddy Shelduck though.
