I find it easy to understand how Foucault's pendulum works at the poles, the pendulum oscillates in a fixed plane and we, along with the earth, rotate around it. So it appears that the pendulum's plane of oscillation rotated.
But how does that work if you are not at the pole? Surely then, if the earth rotates, you and the pendulum travel along with it? What have I missed? Something just does not click. If I am in London watching a pendulum, and as the earth revolves the pendulum moves with me and the earth?