Physics asks the pratical questions about our reality - how did our universe come into existence and how does it work? A physics degree will look at the fundamental laws that govern our universe as well as looking into emerging fields in quantum physics and mechanics. University courses will vary widely in topics available to study so make sure you delve into their topic list before narrowing down to 5 choices.
People to talk to in school: Mr Khan
According to UCAS, the average offer for a Physics course at UK universities is AAB - HOWEVER - this will differ depending on the university you apply to.
UCAS: https://www.ucas.com/explore/subjects/physics-and-astronomy
USEFUL SUBJECTS TO HAVE STUDIED: Maths/Further Maths/Physics/Chemistry/Computer Science
University Subject Guide: https://www.thecompleteuniversityguide.co.uk/subject-guide/physics-and-astronomy
Careers: https://www.ucas.com/explore/subjects/physics-and-astronomy#careers-where-it-can-take-you-