Thank you for your replies.
I will look into LP+ or Kite as alternatives, as they sound fairly promising.
Ephelyon: I agree with what you say about Moodle in a Primary environment. I feel that our old system was far too clunky and complicated for the younger children. Also, out LA platform was not 'that easy' to administer as it was fairly tied down and used to frustrate the hell out of me.
However, I have now been playing with setting up Moodle on an EC2 instance as a 'test' platform, should we decide to host it ourselves, and I am running into problems with even the basic set up, but I will not be beaten by it!
By the time I return to school, next Monday, I would like to be a position where I can give them a few options, feeling fairly confident that each of them will work and will be better than what we had before.