I have been told that Pied Oystercatchers breed south of here in greater numbers than we see around here. They then fly north and disperse.
I wondered if I could definitely ID any juvenile birds but this was the only one I was sure about. The legs are not quite so pink, the eye is more brown than red, and there is a darker patch on the lower part of the beak.
I have seen similar flocks of Pied Oystercatchers roosting here in other years and when I searched my photo archives I found this photo - taken in 2009 and also in January.