Countryside Survey 1998 mapped estimates of Broad Habitat areas in Great Britain - Barr, C.J.; Bunce, R.G.H.; Clarke, R.T.; Gillespie, M.K.; Howard, D.C.; Maskell, L.C.; Norton, L.R.; Scott, R.J.; Scott, W.A.; Smart, S.M.; Stuart, R.C.; Watkins, J.W.; et al. (NERC Environmental Information Data Centre, 2014)