Hi,
Im actually studying with the OU at the mo, as my Access is nearly 3yrs old now so I wanted evidence of recent study. I know they do offer a Human Biology course as I tried to get on it but it was full. Also, I think its a level 2 course and they advise you to do a level 1 course first. Im not sure how Notts work with the OU, it may be a certain amount of points you need. I think if you can definately get an Access course that will give you all the credits in one, go with that. Otherwise you may get bogged down with all the studying.
Gx