@Polecat03
Yes you can be an E and "not busty", cup size doesn't determine what people imagine it does, it's all relative to the band sizing. I've been fitted to 28E, 30E, 28F, 32DD - I don't have a large bust though.
..
Thank you for explaining it much better than I would have. For those interested look at BOB, they have some helpful guides on bra sizes.