Further maths isn't really important for Physics based courses. It can help your application, and you'll be a bit ahead for parts of the course, but overall, it won't disadvantage you if you don't have it, as a lot of schools don't even offer further maths, and all the extra content you will have learnt will be covered in the degree anyway. Chemistry is supposed to be a big advantage for Physics degrees, and if you really enjoy geography, I'd pick those two over further maths. But it's up to you and what you find most interesting and think you will do better at.