When I was little, my parents were Tory voters and I never really thought that serious, real grown-ups would ever vote labour/left. (Still as innocent in 2016, I couldn't believe that any serious grown up could consider voting for Trump)
I left the UK aged 19 and only took on German nationality a couple of years ago so have only ever been able to vote in one General Election ever in my life. (Last year here in Germany, when Angela Merkel retired as Chancellor) As the system here is proportional representation you get to vote for a person and with another vote you choose a party. The two don't have to be the same party.
From decades of observing, I had decided that whoever you vote for, they all eventually end up the same and none of them keep their election promises. So last election, I went with gut instinct and neither the person nor the party I had picked got in, so I don't know why I bothered.