My parents always voted Labour, but my maternal grandparents were small C conservative Polish immigrants, and voted big C Conservatives, despite having no wealth whatsoever.
My first vote came when I was studying at Cambridge in 2005, and the momentum was with the Lib Dems, who aligned better with youthful idealism and the likelihood of subsequently going to work for the Big Four or the Magic Circle three years later. So I voted for them.
I again voted for the Lib Dems in 2010, seduced by Nick Clegg and his tuition fees policy. Although the rise in tuition fees had not affected me, I felt that it was a deeply unfair policy, and turned me off Labour at the time.
I left the UK in 2012. I was broadly OK with the Conservative-Lib Dem coalition. It coincided with a time where I started to make more money, and I think there's no one more vulnerable to low-tax discourse than someone who comes from nothing but starts to earn. Gay marriage and a general cosmopolitan, open London seemed to confirm to me that the UK was being competently run.
Brexit was the moment that shattered all of this. I think there are few who are as ardently anti-Brexit as I have been over the last 6 years. I genuinely despise it with every fibre of my being. On a very personal level, it was traumatic to have my right to live in the EU removed as I lived there. Thankfully, both my parents had alternative EU citizenships. And then on a broader, but still personal level, it caused a kind of rupture with my relationship to my country. I could not really bear to be associated with Brexit Britain, and developed an antipathy to the "white English" identity in many ways.
Everything that has happened since has given me a life-long hatred of the Tory party, and I hope to see Johnson, Raab, Patel, et al. in prison one day. Whether they committed crimes or not.
My position today is broadly still a Lib Dem one (pro-European Macronism if you will), although I lean more into socialism than previously, because I feel that the social ladders that I benefitted from (affordable higher education, a reasonably well-funded NHS, freedom of movement in the EU) have been stripped so viciously away from the youth of today, that only a swing back to the left will reinstate the status quo of my adolescence.