@curlysouffle There's a rise in energy costs starting from October I think it was. The only way to lower gas and electricity is by using a meter. We rented a property that had a meter and we paid £50 per month for both. I would say £100 is fairly cheap. We currently pay £170 per month (we barely use any gas). But we both work from home and there's 5 of us and we have 3 reptiles so that doesn't help. A fixed energy contract does not mean they cannot change or increase your direct debit it just means they won't increase the kw/h cost over that fixed term. So around winter time it will most likely increase. Because gas and electricity is considered a necessity if you are struggling to pay just call them up and have a chat with someone. Don't be afraid to ask for help, often if you get a nice person they will reduce your payments for you.
Water meters are also way way cheaper too.
To reduce other bills your phone company can half your bill if you're struggling for money. They'll only do it for a short period of time 3-6 months but that can help greatly.
Finally regarding food shopping I buy online. My budget is £180 per week but that includes nappies, general household cleaning stuff as well as snacks and food. I usually spend about £140 to feed a family of 5 (and a tortoise and bearded dragon who need fresh greens). I have 2 young children and 1 teenager. I cook everything fresh and have 2 deliveries a week. Generally buying online I find you buy less rubbish. Also if you go over your budget I say to myself do I really need that and if I don't then I remove it. I also save lists and rotate a 12 week meal plan list which helps me budget. Some people hate online shopping but I love it and would spend double in the shop. Every time you go it's £40 even if you're just buying a few things.
It takes a bit of getting used to but would highly recommend it and also a delivery pass because they're worth paying for.
Hope that helps