Just a quick note to say that I stopped off at the reservoir yesterday 
afternoon at about 3pm and saw:

Coot ca. 40
Ring-necked Duck ca. 15
Redhead  5
Horned Grebe 1
Ring-billed Gull c 200 (plus some Herring Gulls doubtless)
Gt Black-backed Gull ca. 15

Cheers

Gary