Gull Roost or Dull Roost

Why, oh why, oh why, do people do gull roosts? Staring through the murk at little white blobs bobbing up and down in the water, looking for a blob with a bit more white somewhere, or a bit of a darker grey bit or whatever....but it is darn addictive and one of the most exciting of winter birding pastimes...if you do Grafham as a patch that is. On Sunday arvo, the light was nice and some of the gulls were actually at a reasonable distance for once. Shortly after starting the larid scrutiny, a fine adult Caspian Gull with typical weedy reedy beak and bullet hole eye pitched in in a near group and I managed a couple of shots. I had to head for York, so I left fellow gull-nutter, Mark, to continue the grilling.