dh knows about low carb and happily eats that way too but likes to have a day off at weekends and I think that doesn't work for me, as once I have one biscuit I just want more and more, as mentioned by someone (sorry, I'm on my phone so can't scroll back).
Well, he doesn't really know about low carb then, does he?! Have either of you done any reading about it? Get him to read more so that he understands what he's doing (i.e. sabotage) by doing that. However, the other thing worth considering here is introducing a type of meal or food that for you both is really special, so it is a treat but still low carb. So why not something like steak and celeriac dauphinoise, with a salad with a garlicky dressing/mayonnaise? Don't buy biscuits any more, so they're not there to tempt you. Buy some really lovely salted (low carb) nuts, like macadamias and have those as a snack.
Also the things I struggle with are when I've had a really busy day and want something really quick to prepare, when I'm starving and it's much easier to grab a biscuit or a slice of toast. I don't know what low carb snacks to have apart from cheese.
This is an excuse! You need to meal plan and make sure you have stuff ready to eat. Do you have a slow cooker? Chuck some stewing steak with some leeks, shallots and swede (for example) in there in the morning and you'll have a lovely casserole waiting for you when you get home.
And get rid of the biscuits and bread. No need to have them in the house, especially if all they're doing is tempting you.
Nothing wrong with cheese as a snack, as long as you're OK with dairy. Why not try making Parmesan crisps, so you've always got some of those to hand? Really easy to make - just dollop a few piles of grated Parmesan on a non-stick baking sheet and cook in a hot oven for about 10 minutes till melted and brown. When they cool they go really crisp. You can sprinkle some cayenne or black pepper on them before you cook them, for an extra spicy note.
As I said up thread, nuts make a good snack (although careful you don't go overboard with these, as they can get carby quickly), along with olives. And you can get some lovely different kinds of flavoured/stuffed olives these days.
I also am struggling to drink enough, as apart from black coffee everything I want to drink has sugar in it
You have to get through this. I find sparkling water more interesting than still or tap water. Others have put slices of lemon, lime or cucumber in their water, to add flavour.
It's really important that you push through this. The whole point of Bootcamp is to help you break the hold that sweet things have over us. And drinking water helps with weight loss too.
I know you might want sweet things. This is the carb addiction speaking!
And I seem to have the problem that when I don't lose weight I think, s*d it, I might as well eat what I want if I'm not losing weight anyway.
You're not alone! But this is the other 'you' speaking again. Why do it to yourself? The only thing you're guaranteeing by doing this is that you certainly won't lose weight and will even more certainly put it back on. Why do you think you are not worth losing weight for?
The strategy you're following at the moment is not going to help you lose.
The sort of things we were eating: bacon and eggs for breakfast, hm veg soup for lunch, chilli without beans or rice for dinner, snacks of Salami, cheese or coleslaw, lots and lots of black decaf coffee.
Bacon and eggs is perfect. Veg soup could be very carby, depending on the veg you're using - would be better to have something more protein and fat based. So tinned tuna (in oil) with salad with an oily dressing, for example. Chilli is OK, but even better if you serve cheese or sour cream on the top, for more fat. Snacks are OK - although salami is processed meat, and along with the bacon is something for occasional rather than regular use - and coleslaw could also be very carby.
So overall, it looks to me as if you need to up your fat and keep and eye on the carbs.
And get rid of the biscuits, and drink more water! 
I'll pick myself up and try again today smile