Diabetes UK have a section of their website talking about diet in Type 1 here.  

Emma Porter lives with Type 1 Diabetes and is an advocate for the use of low carb diets.  People with Type 1 can find this helpful as a way to loose weight and avoid weight gain.  By requiring lower doses of insulin you also reduce the risk of over/underestimating your doses. Check out her website here and also her book which is available on Amazon.  There are a selection of free recipes on her website and a blog of her experiences.

Jen Grieves (of Type 1 on 1 podcast) has a video on Food and Type 1 Diabetes

which you might find useful.

My Diabetes My Way have a page on diet.