Over half of those who voted wanted them. Some of those who didn't vote for them wanted them, some of those who didn't vote at all may have wanted them, some of those who didn't vote may not of wanted them. The sum of those who didn't vote is irrelevant as they did vote so don't count their...
The landslide of 1997 where Labour got 418 seats to Tories 165 was 43.2%, Hardly a big difference and yet a massive majority in seats due to the very biased system (in Labour's favour)