Mr V, good on you. I have spoilt my paper in two previous elections when voting in "safe" seats.
Now I have the dubious benefit of living in a marginal, I have the responsibility of voting for an individual whose personal sentiments I abhor, because they represent a party whose collective sentiments I, on the whole, agree with. Anjd I prefer that choice to PR which, with the benefit of hindsight and experience, I believe would actually take choice away from more people than it gave it to.