User the ingredients list is:
Each single dose sachet of granules contains 3.5g Ispaghula Husk B.P., in an Orange Flavoured base containing Aspartame E951 and Saccharin Sodium Sweeteners, Potassium Bicarbonate, Sodium Bicarbonate, Polysorbate 80, Silica Colloidal Anhydrous, Citric Acid and Beta - Carotene and Riboflavine, Sodium Phosphate Colouring
So carb count probably negligible but full of artificial sweeteners, which we try to stay away from on bootcamp. Do you suffer from constipation? Personally I'd take milled flaxseed instead, but I'm going to leave this for BIWIguru to answer!
My double cream is 2.3%, so fine. My creme fraiche is 2.6% and 4.1% sounds pretty high - are you sure you didn't buy the half fat one (that's got modified maize starch in because they took out the fat so it tasted shit
and hence a higher carb count)?
aNote no worries. It's a big fat NO to hummus, I'm afraid - you'd better hide that before BIWI comes after you with her big stick. 
I'll go and look at the allowed veg list now but I'd be surprised (and very pleased!) if butternut squash is on there. On previous bootcamps it's been verboten, and you certainly shouldn't be eating it in the first fortnight when you're not even allowed berries etc. Don't worry, there's plenty of delicious stuff you can eat. 