I'm not persuaded that candidates from the same party running against each other in public leads to less corruption. If candidates running against each other on the same ticket are not allowed to publicly criticise each other, they may make behind the scenes corrupt bargains.

I think the overall level of corruption depends on the culture, although I think the electoral system affects the pattern of corruption.

That said, I'm happy that the Tory man of the moment is talking about a more proportional electoral system, even though he doesn't use the words.