I don't believe it's at-will employment though in the UK. You have to give a month's notice because your employer can't arbitrarily show up at your desk, say p

I don't believe it's at-will employment though in the UK. You have to give a month's notice because your employer can't arbitrarily show up at your desk, say pack up your stuff and get out of the building within the hour (with security hovering around you and your computer locked down) and this is the last day we're paying you for.