i definitely would NOT leave my job at 27 to start full time university...
UNLESS, you can be near certain that while you are in education, you will be able to get some work experience as-well, one, because you obviously need to live, and two, because at the end of those 3 years, that gap on your CV will make it very difficult for you, 30 is quite young to you and me and most people, but in the job world, a 30 year old with a three year gap is setting himself up for a relatively hard time finding a job
you can apply for extra grants at uni since you have a kid and stuff, but those are dependant on whether the kid lives with you and if you are on the birth certificate (as-well as other stuff) i think that uni courses starting in 2015 also have changed a few grants to loans, i was given a total of £9900 in grants since i have a kid over the 3 years i was there, but if i started a course now i'd have to pay it back along with my student loan
getting a degree will increase your job prospects yes, but not MAJORLY, a lot of (if not most) employers value practical work experience over a degree that shows you are capable of getting an education - anyone with half a brain can get a degree nowadays, i got a 1st with minimal effort, i dont even understand how people can be happy with 2:2's and 3rds
there is no job that truly suits a parent in my opinion, my ideal situation would be to own a business, be getting paid a ton a month, and be able to spend all the time with my kid, but for most parents that arent in this situation, there isn't a job out there that makes it any easier. Im about to start a full time job, my other half works a shift job, and even though we have sorted out childcare to a tee, on paper it looks perfect, but the reality im sure it will be far from. you just do what you can with what you have and hope for the best
best of luck, but whatever you do, dont go into university with the idea that you can just do your 3 years and come out with employer's clutching at you