This is approximately a "double major". For those in the UK unaware, "X and Y" suggests an approximate 50:50 split. "X with Y" suggests a heavy emphasis on X,

This is approximately a "double major". For those in the UK unaware, "X and Y" suggests an approximate 50:50 split. "X with Y" suggests a heavy emphasis on X, more of a 75:25 split. And as others have pointed out, in the UK, apart from in some specific degrees (Cambridge Science Tripos springs to mind), the idea of completing a degree out of mainly self-selected units is a bit crazy.