In my experience. Nobody in the UK has a house big enough! In all the places I have lived in, I might get 6 or 7 people in one room. Yes, Rich people have big houses, but, they're not interested in music. America has lots of big spaces, big houses, etc. England, sadly doesn't.
It's just not a UK tradition. Whether that's good or bad, I don't know. It's just how it is.
Maybe, (even if space were available) Us Brits feel uncomfortable letting people into our personal space? Discuss!