I hardly think that the result in Scotland smacks of Conservatives changing boundaries to suit themselves. Or if they did so, it have been the most massive failure.
There is a lot of corruption in Scotland, like it or not. I've heard of council house tenants being moved, of backhanders being given in the form of new build houses by developers to relatives of councillors for granting pp (big scandal in East Kilbride a few years back involving Jack McConnell's constituency I seem to remember).
And then of course there is the more insidious constant pressure that no-one votes Conservative, everyone in Scotland is left wing and socialist and you must vote in a similar way.
This is a recognised psychological response in humans called social facilitation. We want to be like other people.