For a United Kingdom culture that is individualistic, it would appear to be a difficult task to have a coalition. One could argue that a single party leading would provide more stability because they wouldn't have to agree with the other half, as such. Then again I haven't experienced anything but a single party in government so I can't say what's good about a coalition.
However, with everyone prone to moaning about the government, and with two parties more than one in an increasing multicultural country. It could be a good idea for two parties as it would allow more multi-diversity in that there's two views and "two minds are better than one" as they say. But as mentioned before, they could just lead to more moaning, moaning, moaning. Or what Mr. Milliband said this morning about the NHS reform by Cameron.
Though, I have no idea about British politics and I feel like an idiot that I don't so I'll keep an eye on this thread, haha . . .