On this basis it can be
argued that the BNP cost Labour at least 9 seats in 2010: the seats where Labour lost the seat, and the winning margin was less than the margin of the BNP (votes taken from Labour)
over UKiP (votes taken from Con / LD): Amber
Valley, Bradford East, Burnley, Corby, Dewsbury, Nuneaton, Sherwood, Thurrock, Warwickshire North (7 Conservative gains, 2 Lib Dem).