If you have worked for three years or more since leaving sixth form and can proove it (i.e payslips) then you are not a 'Mature Student' (this usually applies to those over 25) - you are actually an INDEPENDENT STUDENT and subsequently any loans you receive will be calculated based on YOUR income and not your parents. Thus - you can effectively get a shed load of cash plus an 'access to higer education grant' (£1000 per year NON repayable).
I went to uni at 22 and graduated last sept with a 2:1. Hands down the BESt thing i ever did and i miss it dreadfully ever since.
Go and speak with your local COnnexions office - they helped me choose a course, apply for loans, apply for uni and basically get into uni. I cannot thank them enough for their help. Its not hard but a helping hand is always good.
Oh and visit the UCAS website for all the info you need.
Go to uni, ignore the student haters on here as you will likely end up paying their wages in the future. IT IS hard work provided you dont choose a micky mouse subject and it will set you up for life. Just make sure you do a subject that interests you. My last year was seriously difficult but ended in a 200 page dissertation which got me my desired grades. Sure there is a lot of time to **** around and have a great time but you have to work hard and play hard to get on properly. However, i do agree that the first year of uni is a complete **** up and one which should be spent mostly drunk / naked and or covered in girls - jam optional.
Enjoy the many many many beers, funny nights out, great friends and the independence.