Hey,
I'm 26 and am currently doing 3 A levels in a year. I'm doing this because I messed up my A levels 10 years ago, and need 3 A's to get into Uni.
I really wouldn't recommend doing an access course, unless you were 100% sure which uni you wanted to go to and it was through them.
I've got a professional development diploma which is equivalent to a degree, but fairly unknown, I'm a qualified English as a Foreign Language Teacher, and I have financial advice qualifications - all of which counted for NOTHING when I applied as a mature student for uni because they had no UCAS points.
I've now reached the stage that the only chance I have of getting into uni is through these A Levels, and at times I really regret spending time getting my financial qualifications and my PDD which aren't actually helping me achieve anything.
It could just be that the uni I'm applying to is mega fussy, but with the reduction in funding and places happening all over the board, I wouldn't want to take the risk.
I'm studying via distance learning with ICS (who I would not recommend at all), it is quite a lot of work, but I'm able to keep on top of it by being strict with myself - so I'm sure you'll be able to as well.
Do bear in mind the costs though - like I said, I'm doing 3 A Levels, getting the materials and all the ICS stuff was about £700, then you need to shell out for books, and to sit as a private candidate at a college costs approximately £75 per unit (in my case this comes to £900 on top of all the rest). Also, the deadline for registering as a private candidate with a local school/college to go and sit the exams is coming very soon - end of Sept for some - so you need to make a decision pretty quickly.
Hope some of this has been helpful.
Good luck!