I do History, English literature and Maths for A2 and did Psychology last year. I think the most important thing is the fact Physics and Maths compliment each other as do History and English so if you want to go down either route you are perfectly within reach. I know M, H and EL work together nicely and the constrast provides a welcome break from heavy maths or heavy essay subjects. I'm also a natural essay writer so am glad I did what I knew I would enjoy, and if you enjoy these subjects go for them as they aren't restricting.