When voting, you may rate your candidates in order of preference First, Second or Third…….etc. Then the first candidate, after votes are counted and re-assigned, to reach 50%… wins.
Personally, I believe it’s nonsense as most people will only vote for their preferred candidate and will not bother, or want to rate others. Would you give even a tiny piece of your hard won vote to a lib-dem or TORY? I certainly wouldn’t! If I ever had to vote under AV then I would only rate Labour & Green or a left wing alternative. So in essence it’s only 1st choice and maybe one other and that’s fine ‘vote as many times as you wish’ – Electoral Commission website.
This is the most convincing explanation I have found-In favour of AV
Why are the Tories scared? They think they will lose big time if old voting system goes. Ed Milliband says :- “The tragedy for progressive politics in Britain has been that division on the centre and Left has handed a united Right victory after victory. For most of the last 80 years, there has been one Conservative Party but several competing for progressive votes. No wonder the Tories back the current system”
A reasoned argument here from Andrew Penman and Nick Sommerlad, Daily Mirror