There are several recent books which contain species accounts which may be relevant:
Kear, J. (ed) 2004. Ducks, Geese and Swans. Bird Families of the World, Oxford University Press. 900pp
Madsen, J., Cracknell, J. & Fox, A.D. (eds) 1999. Goose populations of the Western Palearctic. A review of status and distribution. Wetlands International Publ. No. 48, Wetlands International, Wageningen, The Netherlands. National Environment Research Institute, Ronde, Denmark. 344pp
Forrester, R. et al. (Eds) 2007. Birds of Scotland. SOC, Edinburgh
Wernham, C.V., Toms, M.P., Marchant, J.H., Clark, J.A., Siriwardena, G.M. & Baillie, S.R. (eds) 2002. The Migration Atlas: movements of the Birds of Britain and Ireland. T. & A.D. Poyser
plus
Annual WeBS reports. Eg. Banks, AN, MP Collier, GE Austin, RD Hearn & AJ Musgrove. 2006. Waterbirds in the UK 2004/05: The Wetland Bird Survey. BTO/WWT/RSPB/JNCC. Thetford.