Here's a thought: everyone is arguing about which is better: AV, AV+, FPTP or STV. Or at least, lefties are - clearly STV is best! - but instead of gambling five years of potentially ruinous governance on a proposition with no local evidence, why don't we run some trials, eh? Take ten random constituencies and have them vote AV, another ten, AV+, another ten STV. See what happens. Take some time, get some evidence.
Is that really such a crazy idea?