I was wrong this morning, no increase in gulls at the reservoir roost this evening.
But the Black-necked Grebe swam past on it's way up the reservoir. Also after 1 adult likely Yellow-legged Gull, a nice distraction the adult Ring-billed Gull, although sleeping, after 5 minutes did have a nice paddle around the other species present. Again mainly, c500 adult L BB's with a handful each of the other regular species.
Worthy of a look, Martin Garner's Birding Frontiers, see the breeding Ring-billed Gull stuff from N. Ireland, inc. nice photo!
http://birdingfrontiers.com/
Don't be put off by -- Yellowhammers? and Canada Geese -(up to 6 six species with 217 taxa!!)