I found the DESMOND course useful in that it reassured me that I wasn't about to go blind, have my feet amputated, or get any complications if I controlled my condition.
The dietary advice is to eat portions not bigger than your fist, including carbohydrates. The nurse giving the talk did mention this forum and suggested we look at it, so perhaps she was hinting that there was an alternative to the official NHS dietary advice.
I have learnt more about this condition and how to deal with it on this forum than from the DESMOND course, but it is only about 6 hours.