shovell.com

OK so in an update to my previous post,  I found this site by Paul Jefferson which gives a pretty good stab at doing a prediction albeit with some pretty big assumptions

but the results for the last election would be

Nationwide

Across the UK a switch to AV is estimated to:

• Cause the Conservatives to lose 22 seats
• Cause Labour to lose 10 seats
• Cause the Lib Dems to gain 32 seats
• Allow the Lib Dems to form a coalition with either party
• Details for previous elections can be found here

And its based on Data from here

So for my constituency, there is a change of MP, Brentford and Isleworth – AV Election Results.

So there is some data if you do some digging (and yes maybe I should of first!) Why not check it for yourself  for before you make your mind up.