Centre of Excellence Diploma? Is it legit?Watch
They are not recognised by universities. CoE courses are more for self-improvement, and for "professional development".
I was also thinking of learning at ICE at Cambridge University, to gain either a CertHE in Genetics or Evolutionary of Biology. Do you know much about that please?
If you would like to do something more recognised and official, then check out the Open University. They provide distance learning degrees, for lower prices than a typical university course.
You could also check out Coursea, they're similar to edX.