They can be subjects, nationals, and/or citizens. Those are all distinct and all still valid, and it is possible to qualify for more than one at the same time.

They can be subjects, nationals, and/or citizens. Those are all distinct and all still valid, and it is possible to qualify for more than one at the same time. Including those of us who don't qualify for any of them, there are 8 possibilities. The UK has a web site that attempts to help people figure out what they are and what they could transition to. It's insanely complicated.