Most grad jobs don't stipulate that you have a specific degree, only that you get a minimum grade.
You can do a hell of a lot of things.. Even Law you can apply to firms as a non-law student, they'll fork out money for your GDL and LPC.
Prospects are entirely up to what YOU want to go into, and how you spend your outside-of-uni-work time to develop skills, experiences and knowledge that you'd need to be considered a competitive applicant to your area of interest.
It's the same no matter if you did an engineering degree, maths, history of art, zoology etc everyone has to deal with finding a career they want to pursue and making themselves competitive. Medicine (and some other healthcare courses) are different in that you decide on the career the moment you apply to the subject - and fyi, you can do grad entry med if you wanted to as a zoology graduate.
So, if your interests lie in something more commercial then do what I said (find out what area you want to go then gain skills, experiences and knowledge for that area and apply to all opportunities) or if your interests are in research: try to get research placements, apply to masters/PhD programmes, if you want to go into teaching: prepare for and apply for teacher training.
It is not so simple as: 'ew, this degree has poor grad prospects stay away', but more 'there are so many things you CAN do, and you have the opportunity to be competitive for those things but it is up to you if you put the effort in to prepare or if you say sod it and end up with no grad job after uni".
And no, you don't need any additional masters or qualification to get into careers that are not directly related to your degree unless otherwise required (i.e. conversion to psychology, grad entry med, law conversion etc).
Prospects are what you make of them.
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