Of course you can, if you do the night qualification. 5 hours flying, and there's no test. It also has no exam. If you're steaming through your PPL it can be done as part of the 45hrs, or you can leave it until afterwards. Some schools try to dissuade students from doing the NQ during their PPL course as potentially it's worth another £500+ to them, but if you're making good progress there's absolutely no reason you can't kill 2 birds with 1 stone.
Air Law contains questions on plenty of things you can't do with a basic PPL, and it's always boring - it's not hours related.