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.

A major/minor does not require you to integrate the two disciplines. Presumably at least this degree will require some synthesis.

At my alma mater we didn't have minors at all, only "concentrations" and concentrations were required to be interdisciplinary. Of course St. Olaf is a specific American school, I may be overgeneralizing to Oxford.

UK Universities don't have 'Majors' and 'Minors' you just do your degree course.

Well, I'm from the UK and I've never really understood the "majoring" "minoring" thing (let alone GPAs).

It seems like it has a roughly 50-50 CS/philosophy focus. While I'm majoring in CS, I'm also a philosophy minor in all but name (my university doesn't offer minors), and I really would have liked more philosophy in the mix.