How do I get back into Mathematics after graduating with BSc 14 years ago?

Ive always loved Maths but for numerous reasons I bounced along in general/non-profit admin/management. After maternity leave I have found myself at the bottom again and seriously thinking how can I get back on track. Im 37, I graduated in 2000 with a UK BSc in Math 2:1. Anyone I chat to (non-mathematicians) always say, "it will come back to you" " go for it" etc but what do they know? What do those working in Math think? I especially was drawn to discrete maths, logic and computability. Where are the doors?