Mattw, I am very similar circumstances to yourself, slightly older but have been type 1 since 1981.
I am also due to attend a DAFNE style course in the next weeks which will hopefully educate me a little better. I started a low carb diet 2 weeks ago cutting down like you from 200g to around 100 g per day
Main thing I have done is cut out bread, potatoes, rice and pasta, and beer. Mainly have chicken, fish, meats with plenty of fresh veg, cauliflower, broccoli, carrots, onions, bell peppers, mushrooms. I do allow myself 1 "blow out" a week in the form of a chines or Indian takeaway
I found the app from fatsecrets.com to be very good, not so much for recipes but good for advising total carbs, calories etc in foods. And its FREE