Liberalism is also quite a broad term, which on its own can only really be said to constitute a belief in "equal rights for everyone including the right to private property". The Liberal Democrats, for example, are so-called because they were formed from the merger of the (classically liberal) Liberal Party, and the Social Democratic Party. They are more like libertarians in the sense that they were broadly pro-market but less authoritarian than the tories, but their policy platform has always been more like something that would be described as social liberalism.

In my experience, the word liberal is generally not used so much in UK politics (outside of the name of the Lib Dems), but if someone self-described themselves as a liberal, I think it would be generally understood as socially liberal rather than libertarian.