For reference, all General Election results for the Corby constituency ever:
2010: Con 42.2, Labour 38.6, LDem 14.5, BNP 4.7
2005: Labour 43.1, Con 40.0, LDem 12.7, UKIP 2.6, SLP 1.0, Ind 0.5
2001: Labour 49.3, Con 37.2, LDem 10.1, UKIP 1.8, SLP 1.6
1997: Labour 55.4, Con 33.4, LDem 7.5, RP 2.5, UKIP 0.9, NLP 0.3
1992: Con 44.5, Labour 43.9, LDem 10.2, Lib 1.4
1987: Con 44.3, Labour 40.9, Lib 14.8
1983: Con 42.6, Labour 36.1, Lib 20.3, EP 1.0
1979: Labour 44.3, Con 43.5, Lib 11.8, Oth 0.4
http://www.election.demon.co.uk/notional79.html