Right Dharma, thinking about Bootcamp:
100g berries fruit is not allowed in the first two weeks of Bootcamp
150g full fat Greek yoghurt did you check the carb count?
200g soya milk (unsweetened of course!) did you check the carb count?
Your breakfast alone will have contributed a fair number of carbs to your overall day
10am Cup of tea with milk, no sugar
Lunch : Chicken & vegetable soup with 65g cheese What veg? Do you know the carb count of the veg that you used?
3pm: butter fried mushrooms with a scrambled egg
Dinner : roast chicken breast with skin on, vegetables (broccoli, carrots, 5 Brussels! Carrots are pretty carby - best avoided on Bootcamp, at least in the first two weeks
And having listed all of those, I bet it was the soup... As it was the first day, I used shop bought (DH made one for me last night from the chicken carcass. Will go check! You should be fine here - even if it was shop-bought, any sugar/carbs will have been contained (mainly) in the skin I would think
Hope this helps!
Re daily levels of carbs - Bootcamp rules are designed to make low carbing easy to do, and weighing/counting (IMVHO) only make something faffy and irritating. If you were doing Atkins induction, which is the strictest phase of Atkins and probably closest to Bootcamp, you would be aiming to restrict carbs to 20g per day. If you were following Dr Charles Clark's plan, you would be looking to achieve 40-60g per day.
Ultimately we all have to work out what level of carbs per day will result in weight loss for us all. I would certainly advocate that you look to the lower end of those figures for the first fortnight of Bootcamp, as this will have speedy results as well as really help to get you into the zone, and get your head around low carbing.