Would you try herbal teas, I find a hot cup of peppermint or chamomile tea when I feel peckish, really helps when I get the urge to snack.
For me what works is not to eat anything after my evening meal, but I have several cups of my teas.
Grapes are high in sugar so I would go easy in those and if you can, substitute the crackers for something else. Could you tolerate grapefruit - I find half a grapefruit to curb hunger pangs. Snack on sliced ham, chicken, carrots, cucumber, tuna, apples, tomatoes. Or make soup every few days - just boil up some carrots with a small piece of a stock cube and water and then purée and it's very filling - add cumin or some herb you like to it. Keep in fridge and heat up when you feel peckish, have it with some chicken, ham, egg or tuna in brine for protein, Vary the soups- using whatever veg you like - brocilli, adding some spinach or kale, cauliflower, etc.
I'd be wary of Slimming World as they promote a lot of processed foods and also contrary to what they say, you really cannot eat everything when trying to drop weight. You need to stay away from all bread, crackers, biscuits, potatoes, rice and pasta.
Don't not eat until after lunch - i drink my teas in the morning as breakfasts aren't for me. Around 12 noon I have my first meal of day - it could be soup with protein, baked fish with baked mushrooms and tomatoes, or an omelette with various bits added, etc and a salad with leaves, cucumber, maybe half an avocado, etc. I just use a tiny amount of balsamic vinegar for a dressing. No sauces. A few hours later I will have some fruits with Greek yoghurt - blueberries, raspberries, strawberries. If I'm hungry before dinner I might have a banana. Then my dinner which is cooked from scratch with lots of veg but I do not eat rice, potatoes or pasta. Dinner is a mix of roast chicken, chicken breasts cooked in various ways, fish, bolognaise, casseroles, the usual cooked from scratch dinners but watch the portion size.
The most important person to think of while trying to drop weight is yourself. Cook with yourself in mind (and children of course) but you are priority and if your DH doesn't want to eat what you do, then he can fend for himself.