Wo. The future is kinda bleak.

I suppose it's the same thing in the UK. I'm doing a Joint Maths and Computing Master, but as you said, it's gonna be hard to land a job, let alone any decent one.
What I would advise, is that if you have some mathematical background, to apply for a junior analyst job/internship at some investment banking company. The big names are Morgan Stanley, Meryll Lynch (spelling ?)... but I'm sure smaller ones would do just as fine. Heck, you might move up the ladder faster (often a problem with big companies). They're the one hiring at the moment.
But be sure to target whatever company you're gonna send your CV to. I would disagree with sending out 40 cvs. Done it once, doesn't work.
Apply for specific job, and focus on what you could provide whoever would employ you.

Good luck!