Help! Let me out!

This meadow pipit (?) isn't really behind bars, just on a wall near a fence having a darned good sing. Had a brief sortie in the moors today but although I heard skylarks and and curlew, didn't see much within camera range other than the pipits. Did get a glimpse of Mr Ratty (water vole) peering out from his hole. Can't believe it's April - this weather is amazing!