I have just graduated with a HND in Computing (Business IT), awarded by Edexcel and run by RDI. I thought the staff there were excellent. I was always treated like a student, not just a number and they always replied to me in a timely manner if I e-mailed as opposed to ringing them.
I enjoyed the course so much I'm now applying to top my HND up to a BA (Hons) Business Computing that they offer with the University of Teesside. This course is completely online as well (the HND is text based), I'm really excited about getting my teeth into it!
I highly recommend them, but don't take my word for it: go to their website, you can see other student reviews! http://www.rdi.co.uk