We met Bob and Annie on the north side of the Millpond: very little about apart from a distant small group of large gulls. Shortly after we parted, a flock of 300+ mainly black-headed gulls flew in from an easterly direction and dropped onto the water. I didn't count them properly - I thought Bob and Annie would probably do that - but did pick up a nice adult Med gull with full black hood in the middle of them, plus the odd common gull.
