Sainsbury have HiLo bread at 5g carbohydrate per slice. I sometimes have this as toast for breakfast. I always have a loaf in the freezer.They also now do a low carbohydrate wrap at 14g carb per wrap. I bought some at half price the other day but quickly realised that the carb content was more than I wanted so I gave them away.
More useful are Aldi's edamame and mung bean fettuccine at 3.0g carb per 100g cooked weight and black bean spaghetti at 1.6g carb per 100g cooked weight. These were good transitional foods as I began to adapt recipes and eating patterns. However, I quickly came to realise that meals were just as enjoyable without rice substitutes, bread substitutes or pasta/noodle substitutes and I rarely use them now.