Hey Joanne, I hope your results went good!
When writing about books try giving an example of something you found interesting in that book, this is my book segment of the PS:
"To widen my Physics knowledge in preparation for the course I have read many books. My favourites are part of The Very Short Introduction series of which I have read books titled; Cosmology, Relativity, Nuclear Power, Particle Physics and Quantum Theory. I found reading books like this very enlightening as it covered topics I vaguely knew about in more depth. In Quantum Theory by John Polkinghorne, he writes about the possibility that the probabilistic nature of Quantum Theory could stem from the fact that we don't know enough about sub atomic particles to achieve a classical theory, much like if we knew everything about the conditions of a coin throw we would know the outcome. Instead we say heads has probability half. I found this very thought provoking."
For other things to say, become a member of the IOP and say you enjoy keeping up to date with Physics research with the magazines you receive every month
Other than that I can't think of anything else, mention how your English AS will be useful with literacy skills, vital for reports and shiz at uni
Hope that helps, also I'd look at Sussex and Southampton University if they're close enough