1-1 cambridge diet

Apologies uve searched but couldn't find much info. Is it wise for a type 2 insulin dependant diabetic 17 stone, diet ok but could be better, does 30-45 min evercise 3 to 5 times acweek to start the above diet? My sugars are in tge range of 12 to 15 most days even if i eat healthy i just cant...