Better the devil you know. I think this can be safely filed as an administrative error. Not some indication of widespread corruption. As TFG said, the expenses thing was MP's jumping through loopholes (at best) to feather their nests. This looks more like a misunderstanding of how, if and when something should be double charged. I also doubt that the "battle bus" made any difference at all to the outcome.
In other news, I will be severely pissed if the baby boomers that fucked up the housing market for us go ahead and fuck up our place in Europe because of some outmoded, age of empire, xenophobic stupidity. http://www.theguardian.com/politics/2016/apr/02/eu-referendum-young-voters-brexit-leave Seriously old people, this isn't going to affect you. You've got your pensions, you've got your house(s), you don't have a job for an immigrant to take, just leave this one to people that actually have a stake in it.