Parliamentary Voting System and Constituencies Bill

I am grateful to the Minister for giving way, and I am sorry if I exasperate him by intervening. Perhaps I may return to the point that my noble friend Lord Campbell-Savours put to him. I do so because I have experience of campaigning in referendum campaigns both in Scotland and in Wales and it is helpful to be equipped with the arguments on the doorstep. I have read every single word that has been said in these Houses of Parliament on this issue. I cannot find one explanation of why this form of voting is the best of the alternative forms of voting available. Will the Minister please point me to where I can find that qualitative assessment of this form of voting?