Although you can hear reed buntings very clearly, they are really difficult to photograph as they stay deep down in the reeds. However, I waited patiently and this little fellow flew across the path and into the reeds with quite a beakful so I suspect that he has a nest with babies waiting to be fed. This is probably the only reason I managed to get a shot of him. Not a terribly good one but at least I succeeded.
Sparrow-sized but slim and with a long, deeply notched tail, the male has a black head, white collar and a drooping moustache. Females and winter males have a streaked head. In flight the tail looks black with broad, white edges.