(Great) Cormorant
Phalacrocorax carbo

These can be seen at coastlines, river estuaries and lakes in Britain and they are moderately common. Photos 4 and 5 are of a first-winter bird (white belly and grey neck).
 

  

  

  

  

1-3: Ryde, IOW, 01/11/2006.
4-5: Virginia Water, 27/12/2005.
6-7: River Exe, Exeter, 13/01/2007.
8: River Exe, Exeter, 24/04/2006.