Sounds challenging Mountainmetman, your perseverance will be worth it in the end. I have heard good things about the OU science degrees.
Lynette, it sounds like you'll be timing it perfectly. My husband works from home so fortunately for me he was able to look after our son whilst I did the Access to Higher Ed on a part time basis. The fast track A Level on the other hand was a conscientious effort during my son's naps and after his bedtime as it was a distance learning A Level. It certainly yielded an ability to work under pressure lol, so I hope I can transfer that skill to uni. One piece of advice, pick your subjects early as the popular ones like English and Psychology get full very quickly. One thing that you may also find advantageous within this next year could be to find out what the syllabus will be for each of your subjects (provided it's not changed annually) and do some preliminary research. This really helped me, particularly with History and part of English.