Thatcher 6 - The last opinion polls before the 1979 election
It appears even in 1979 the polls overstated Labour. Mori and Gallup had the Tories in the lead throughout the campaign, but the gap narrowing right at the end. NOP had Labour in the lead in the second last week, but the Tories moving ahead convincingly in the last few days.(Result was Con 44.9%, Labour 37.7%, Lib 14.1%)
Mori - Con 44%, Labour 39%, Lib 14%
Gallup - Con 44%, Labour 40%, Lib 12%
NOP - Con 45%, Labour 39%, Lib 12%