The carbs are 8.7 per biscuit and a touch of sugar
I have the occasional Gullon Sugar Free Maria biscuit (which my local Tesco sells on the "outlet" aisle) and the nutritional info is as below
Typical values per biscuit (6.0g)
Energy 25kcal
Energy 104kj
Protein 0.5g
Carbohydrate 4.5g
of which sugars <0.5g
of which polyols 1.1g
of which starch 3.2g
Fat 0.7g
of which saturates 0.1g
of which mono-unsaturates 0.5g
of which polyunsaturates 0.1g
Cholesterol <0.3mg
Fibre 0.1g
Sodium 0.02g
The polyol in it is maltilol which some people find affects them just the same as sugar but I find it doesn't affect my BS. They have a high carb percentage but because they're so light, there's only 4.5g of carbs in them (including the 1.1g of polyols so it's more like 3.4g if polyols don't affect you)
I wouldn't eat loads of them, but I do have the odd one or two with a cup of tea and not seen any adverse reaction