I think looking at what would have happened under a different system a bit misleading, for two key reasons:
- A lot of people DO vote tactically due to FPTP. How many exactly? Who knows, but there's no doubt this happens. With PR there would be more votes for smaller parties.
- I personally...
Exactly this. Or make East Sussex, say, one constituency. I don't have the figures in front of me but you would get something like 5 conservative, 2 labour and one each of UKIP, green and lib dem which would be far more representative.