I also re-took English A' Level with the NEC and I think they are really great if you want to study from home. I received their newsletter the other day with some links to different courses for, but not exclusive to, writers.
You can check out the links to the following courses here
Writing Short Stories
Writing for a Living
If you sign up or have taken the course in the past it would be great to hear your thoughts on them as I'd like to take them when I free up some study time.