While true that a Labour win would probably mean UK eventually...

While true that a Labour win would probably mean UK eventually remaining in the EU, and business would like that, it would also mean a Labour government of high spending, high taxation and nationalisation of some industry, which business really would not like. So on balance... it is really hard to say which outcome would be preferable from a share price perspective, Conservative or Labour. I know one thing, another hung parliament would be disastrous, so I think at this point, as long as it looks like there will be a clear winner, that is considered good news.