I want to study both chemistry and physics at imperial college london

They don't offer any kind of natural sciences course/ course that allows me to study both physics and chemistry. They have chemistry with molecular physics and other courses that have some kind of intersection between the two, but I want actual chemistry and actual physics - the whole point is I don't want to narrow it down to one in any way until I decide and I believe that chemistry and physics work very well together. Although I believe it is unlikely, I want to contact imperial and ask them if I can study chemistry and physics together by combining modules from each - kind of like building my own natural sciences course. Does anyone have any ideas of what I should say in my email/ how exactly I should convince them/ what exactly I should ask for to convey that I am serious about this. And does anyone who may have studied at imperial know which professor I should email? (Probably a professor that has lots of knowledge in both fields and understands the benefit of cross-disciplinary science). Thank you so much. I am very serious about this as I love the research opportunities at imperial but I really just wish they did natural sciences. Any help would be much appreciated, and I already understand it's likely to be a no.

Chemistry has a physics subsidiary

You can study something like a physics minor in the chemistry course

It's called a subsidiary at imperial, but sorta like that

So to clarify, is a subsidiary an optional module? Is Mathematics and Physics 1 one, for example?