Thanks, that makes more sense now than some of the stuff I've been reading! Not quite sure I like the idea of not knowing who my vote is going to put in as an MP though.
As for the debt, I must be catching the news at the wrong time cos all I hear them going on about is PR. I'm all for a fairer system but I think the priority is to get our country back on it's feet and go from there.
There are many systems of PR. What he's talking about is closed list system. It's the most proportional, but is so at the expense of knowing who will be representing you, and it's difficult to hold individual MPs to account. Another downside is that it is hard for independents to run in one area.
The system the Lib Dems are advocating is STV (Single Transferable Vote). In this system, the country is split into constituencies, of a larger size than the current ones. Each party can field multiple candidates and you rank your preferences, this means that you can hold individual MPs to account (vote for others in your party), and independents can run. What then happens is that each elected candidate must meet a quota of votes that varies depending on the number of representatives to be elected and the number of votes. Consider this situation, where three MPs are being selected (and there are 20 unspoilt ballots):
There are 20 votes, and 3 MPs being selected, so under the most common quota (droop quota), each MP needs:
(20/(3+1))+1=6 Votes
to get a seat.
Any choice with this or more is selected, what happens next is that any surplus votes (IE, any votes above the quota) are transferred to the voters' second preference choice, then they check to see if any MPs meet or exceed the quota.
If at any point, no choice meets or exceeds the quota then the candidate with the least number of votes is eliminated, and their votes transferred to the voters' second preference.
This keeps on going until all the seats are filled.
It's a bit long winded, but I think it's a good system!