On 20th there was an adult and a 2cy Casp on the bank across the road on arrival, and later I found a 3cy on the lake (which then showed up in a flight shot from the original bank! photo above). Later on that afternoon a big flush of the all the gulls on site resulted in a brief flight view of the recent 4cy Glauc too.
Five days later there were fewer gulls again, but the spotty-mantled 3cy Casp showed on the lake again, followed by the dirty-headed 2cy from back in January! A second 3cy was seen only briefly preening on the far bank before being flushed by a dog. Half a dozen michs were seen both days too.