I had the same experience as you when I was choosing options (but I don't want to do law now anyway haha) but yeah DO NOT take Law for A-level, because it's true universities don't like it, basically because as said earlier, they like to teach it from scratch, and they think Law A-level is just stuff that will get muddled up with the university course and unnecessarily confuse you. They want you take other subjects that show you have other skills and useful ones are (like you're taking) History, English, and well that's it really, perhaps another social science like Politics or Economics. But English is the best forth option for you, in my opinion.