Hi CMabalot,
You're thinking about your courses at just the right time! Just to give you my point of view, I'm a commercial pilot -- I went straight to flight school a couple months after finishing year 12. I'm currently working at an airline in the UK and loving it. Most (over 90%) of the people at my school went to uni, that's the way it's structured, so it was a difficult decision to make, but it's the best decision I've ever made.
Your call whether you want to go to uni first or not. In terms of aviation, most if not all European airlines aren't interested in degrees, they look for your licence and your aptitude, so whether you go to uni or not, or what courses you study if you do go, most likely won't matter to them. You'll no doubt have some personal gain in terms of study habits and knowledge, but pilot courses are extremely specific so don't expect to carry much of your uni knowledge into flight school if you decide to do uni first. It's more of a personal decision -- if you feel you want a degree or not (remember you could always study it later in life if you want, or do part time study), or, perhaps more importantly, to have a potential fallback if for some reason flying doesn't work out. It might be worth getting a Class 1 medical soon -- it costs some £s but there's no better time than now to make sure you are fit to fly before committing (I'm sure you'll be fine, but it's worth a check). There's the obvious cost consideration, flight school is very expensive on its own, so you'd need to make sure you can fund that (and potentially the Type Rating afterwards). If you add a few years of university to that it could put some serious financial strain on your family, so be sure to have a chat with them about what is feasible. The courses you're doing now and the grades you mention are more than enough to get you into a flight school so don't worry about that.
What would you miss if you don't go to uni? I'm a quieter person so I never craved the stereotypical "uni lifestyle," perhaps the most difficult thing about my decision is that it means it can be hard to meet people my age since what I do is very different (and I mostly work with people older than me), but I'm a quiet person so that doesn't bother me much, and I meet lots of people when I'm working anyway. I don't have a fallback since I don't have a degree, but that doesn't bother me to be honest, if you want that though that's perfectly reasonable. I'm lucky to work at a great company and earn good money, so provided you do well in flight school and score a good job you'll be financially independent before you know it, probably before any of your peers. (BTW an "integrated" flying course, which I'd recommend, takes about a year and two months start to finish. "Modular" can be cheaper but do not approach flying as a part time course unless you really have to (i.e. for financial reasons), I doubt it would work.)
Some universities offer some kind of flying courses together with degree programmes. It might be worth a look into, but except for Florida's Embry Riddle I haven't heard of a decent one in Europe, most are more private pilot flying clubs than commercial flight schools -- going to a good school if key to getting a solid job afterwards and a part-time semi-dedicated course won't impress the airlines much. That said, it's an option open to you if you want to try out flying if you're not completely set on it yet.
Of course, make sure you're fully into flying: it's a job you will either love with all your heart or completely hate, so make sure you have it in you to stick through flight school. It's not a job you can stick to if you 'just kind of like it,' it takes a lot of dedication. If you are really into it, there's nothing better. The flight school experience is incredible, you'll make amazing friends, gain a very wide knowledge of the randomest things that turn out to be relevant to flying, and, you'll get to fly for a living!
I've tried to make my reply somewhat structured but apologies if it's just a collection of thoughts. Anyway, feel free to contact me if you want more into on flight school/flying as a job, I'd be glad to help 😊 Best of luck with your decision! (And kudos on thinking about this now and not at the last minute!