You could look at maths & physics, mathematical physics or theoretical physics courses.
You could do Maths but then take optionals in more physics related modules.
Or there is Natural Sciences of course, so you could specialise later
Look on whatuni for a brief idea of requirement. I think A2 at B grade is a minimum for most units. My daughter got an offer for theoretical physics at Sussex at ABB, the A in Maths.
A foundation is another option, but comes at a cost of course