Re: a sufficiently motivated person could in fact find out exactly how I voted.
I wrote about this following the EU Referendum - http://blog.mrdrem.me.uk/2016/06/how-voting-works-from-other-side-of.html
TL:DR? Yes, your vote can be tracked, but only within certain timescales, and only with a court order (or some electoral services employee doing a shed load of work on the quiet, with no-one else noticing, or a load of people being in on it, at which point see https://www.theguardian.com/science/2016/jan/26/secret-success-equations-give-calculations-for-keeping-conspiracies-quiet - Although I suspect that less than the critical 125 people would know enough of how the data was gained)
I'm planning on writing something up about the counting process shortly...
Biting the hand that feeds IT
