I was unsure between physical natsci and a straight physics course for a while before I prepared and sent off my application, constantly deciding on one and then running back to the other. I absolutely adore physics and it is my favourite A-level, but I also really enjoy chemistry (maths, too, but my heart lies in the sciences). The chemistry that I really enjoy is the physical chemistry (I do enjoy organic and inorganic too, but definitely not as much as physical). Natural sciences seemed like the perfect option because it means I can study what I like at a higher level, with the flexibility to drop a subject when I'm ready. I can imagine myself specialising in physics - so why didn't I apply for straight physics? - if I am still able to get the breadth and depth in the subject whilst trialling out chemistry at degree level, then no harm done
This means that I can still imagine myself feeling content if I ended up going to Aberystwyth because of physics. It's also an ideal insurance choice for me because I was struggling to find an insurance/safety uni and area that I actually liked.