11,334,576 people voted Conservative at the last election.
3,881,099 people voted UKIP.
That’s 15,215,675 people who voted for parties that specifically style themselves as right-wing.
9,347,304 people voted Labour.
1,454,436 people voted SNP. (To be honest, Scotland is a left-wing country. It’s hard to deny that one.)
1,157,613 voted Green.
That’s 10,959,353 people who voted for parties that specifically style themselves as left-wing. (Whether or not they were left-wing at the time is up for debate too.)
Look, I can do flawed maths on this issue too (there’s a plethora of issues with using this data), although mine is far more likely to be representative of the overall picture than yours, as yours simply indicates partisan affiliation rather than Left-Right opinions within the general public.
[You’ve also got the Liberal Democrats to factor in. But their position of the political spectrum is up for debate, hence why using figures like this (as well as your own) is flawed.]