This forum is based in Canada, and has a section for U.K. members. http://forum.lowcarber.org/forumdisplay.php?f=35 (see post on two nations divided by a common language, aka the sticky on language differences at top of section ) Two moderators are Canadian and Australian, Grav who answered above is from NZ (check out his success story!) and I lived in the U.K. six years and able adjust terms and grammar when needed.
Have you found DietDoctor as a resource. If you join for a free month trial (very easy to stop membership) you get access to high quality talks and films including many on diabetes. Maybe watching some of those together with your wife would help her understand why low carb is best for your health. Here is one example, membership not needed for this one. https://www.dietdoctor.com/lchf-dia...dr-eric-westman