Representative?
The AV, STV systems depend on people accepting that their vote may be transferred to a person who does not represent their views, or at least, less well than their 1st choice.
There can never be a truly representative system unless there are multi member constituencies based on counties or regions. In parliament, the vote of any member should be weighted according to how many votes they received instead of one member one vote.
Still, it will be interesting to see how the parties address the issue. Since no party is in favour of the AV system, how can any of them advocate the change? My own prediction is that electoral reform will be put back decades. And the Lib-Dems will be totally discredited and disappear into oblivion. So long, beardies!