I've been a mature student twice!
The 1st time was for a totally different subject than the 2nd which was IT.
Argh the "University Access Course" will give you a broad knowledge and help you to learn to study & enable you to do the degree if you want to.
It's like a top up of the education you have had up to date. And it will contain all the subjects you will need to further your education in your desired field.
Check with the college/uni on the exact parts of it as they differ from college to college.
HNC's are sought after qualification if taken with A+, N+ CCNA etc. Quals the IT industry like to see on a CV.
Software Engineering will probably cover programming such as C+ etc (not sure about this as it's not a subject I’m hot on)
Anything extra you can study part time such as ITIL would help also.
Oh and good luck