Our gas & electric were the highest bill so we've not had the heating on for 18 months so far and still going... blankets, hot water bottles, we've gone old school.
I get all my e-books from my library's app rather than kindle.
If people ask what you want for Christmas or birthdays, choose things with a monetary value that you'd otherwise have spent on yourself - this year for me this was tickets to a certain gig and a concert. My parents usually get a pair of boots or trainers or coat that I choose - so I'm not spending my money on essentials that last me years.
Kids hobbies & interests all good value - they've got busy lives but it's affordable for us. Scouting is volunteer run and they've had amazing opportunities through their time in scouts which we'd not have afforded otherwise. Rugby and cricket again are volunteer led and the subs are excellent value on a weekly basis, coaches are really understanding if they're asked about payment plans or sometimes they can cover the costs for some of the boys to go to tour or watch a match if finances are a barrier. After school clubs at the school are free so they've done as much of that as possible. Their musical instruments were donated by a local charity on loan. Instrument lessons are free at their school if they're studying music GCSE or on free school meals and massively subsidised by school even if they're not.
Are your kids registered for free school meals? Even if they don't use them, this can give you access to e.g. uniform grants.
I saw mention of Fare Share above, they deliver to a local charity I'm involved in and there are lots of similar community pantries around the country which aren't food banks but where you can get food at a pay-as-you-feel rate or get a hot meal in a warm space. We also have a laundrette at ours.
Citizens Advice Bureau can help.
The Martin Lewis site can help with ideas.
Debt wise, moving credit card debts to 0% interest cards and paying them off as a priority really helped me.
Going through your bank statement and noting EVERYTHING. Cancel any recurring payments that aren't essential. If you don't go to the gym but still have your leisure centre membership going out monthly, cancel it. If you pay for Disney +, netflix, Amazon and Apple - cancel them (or just keep the one you use the most - if it means you enjoy your nights in more that's worth it). Any apps you've signed up for and don't use, cancel it.
Make a spreadsheet and note which debts (including Next or Very catalogue type payments) or credit cards have the highest interest so you can prioritise which need paying off in the largest chunks the soonest. This made such a difference to me, the one credit card was eating such a huge amount of my money on just interest so getting that one sorted first gave me some real breathing room.
Being honest helps. Talk with your bank, they can help with a plan. Talk with any credit cards or other debtors to make sure all your repayments are genuinely affordable.
£7k debt is huge to you or me but it's pennies for some people. You can do this. First step is asking for help. Once you've got it paid off you can start saving and just think of all the amazing things you'll be able to do then and that sweet sweet relief of seeing the numbers go down on your spreadsheet!