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A maths degree should open your options up a lot more. I recently graduated with a degree in maths and I'm now working in risk management for a major airline. However, I would not recommend starting a three year degree now just to improve your career prospects a bit unless you have a very specific goal in mind.
If you are considering teaching then do NOT start a three year degree right now. There are a few ways you could go about this but getting into teaching does not require you to have a degree specific to your subject. The degree that you have will suffice to get onto a PGCE course, all you will then have to do is demonstrate subject knowledge, which the maths A-level should go a long way towards, although many institutions may require something more, this could involve tests on interview day or a more extensive subject knowledge enhancement course. Either way, none of these options will be anywhere near as intensive as a three year degree and will result in you becoming a qualified teacher within a year or two. Teacher starting salaries are around £23k but they rise pretty quickly, and with career progression you could be looking at £30k within a few years and £40k+ within 7 or 8 years. You will also be in heavy demand as a maths teacher. Also your PGCE training year will grant you a huge bursary that only seems to be rising each year, it's something to look into.
Just for the record I don't think you should go into teaching unless you're sure it's what you want to do, I've seen too many people ruin themselves with a career that isn't right for them and teaching is one of the prime suspects. But at the same time, for many people it is incredibly rewarding.