Warbler identification.

Can anyone identify this bird please I saw it on the 16th of February near Keswick, in the English Lake District, and am having trouble Identifying it.  It initially looked Robin like and was singing profusely and musically, but has no red breast.  Possibilities with redish legs combined with its appearancem  song and the fact it was singing on the top of a hedge between a road and a field seem to rule our most Warblers, White Throats and Read Throats.