Hiya, I also really struggled to choose where to do my distance learning course when I was choosing! I'm currently doing a biology access course with AOLL (Academy Online Learning) and can really recommend them - I'm about half way through now. They help with applying to uni too and i already have a conditional offer somewhere (to study physio). I've heard distance learning centre is good.
I've heard really bad things about learn direct and I don't think the reviews are very good so if I were you I'd probs avoid studying with them.
Good luck!