ID help please. Seen at Le Teich bird reserve near Arcachon, SW France. (A warbler?)

Thanks TeeJay. I wouldn't have got this one at all!! Cheers

They are also called Fan-tailed Warblers so you were correct in deducing it was a warbler. I like the "Zitting" though because it describes their call. 

Thanks again TeeJay. The Fan tailed name seems to have been dropped now to avoid confusion with an American species of the same name. You pointed me in the direction to do some research. My hunch about being a warbler was based on the logic that it had a similar shape and size to this one - a Melodious Warbler - seen on the same visit. Thanks again.