Suspect there will not be too many images in this plumage on iSpot yet.
No interactions present.
Judging from its position, I reckon you and keithk must have been standing next to each other when you took your pictures!
My Flickr photos...
There were a couple of people digi-scoping it at the same time so he could have been one of them.
But the bird seemed quite loyal to that spot - it may well have gone back later in the day.
Lat/Lng: 51.5112, -0.4285
OS grid ref: TQ091803