ok here’s what i do.
vote in person on the last day (to make sure you haven’t already voted). vote on a paper record. show an id even if they don’t want it. the id has your address on it. linger a bit and watch what’s going on, the turnout, etc. ask them if there is a poll watcher present.
then wish them all a “brexit day.”
throw away the “i voted sticker.”
oh and the most important thing. drive a friend to the polls.