Small birds at Rutland Water Lagoon 4 Plover hide

Hi all,

Sorry I do not have a photo as the birds were too well camouflaged for my camera to pick out but there were about half a dozen or so on the bank of the lagoon (out of the right hand window of the hide) feeding and immediately I thought hmm funny place for Dunnocks as that is my best initial description, seemingly Grey and brown. However, I was not convinced and on closer inspection I could see a much longer tail which appeared black/brown and white. Looking through my bird book I could not really get to a satisfactory answer and the guy next to me was no help either. Initial thoughts of Linnets were only dispelled by the fact there was not a patch of red on show but I suppose they could all have been females??

Any suggestions? Even the bird identifier couldn't really help! (they definitely weren't Reed Buntings either)