I'm thinking of going to university but not sure if loans will cover my expenses?

I'm 32 years old and I want to do an access course and then study for a degree in Dental Therapy. This is an NHS course.
I currently work full time and have a mortgage to pay. So I don't know if I could afford to quit work and still make my payments. Does anyone know how much I'd be entitled to, or how to find out?
Thanks in advance

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