From the information you look like a candidate for a Debt Relief Order, Bankruptcy or an IVA in that order and the latter would only be appropriate if your job would be affected by bankruptcy and your car is worth too much for the first two options. Has Stepchange explained why a DRO is not suitable and that you should pursue an IVA?
How sustainable is your budget? Be aware that, whatever option you choose, you have to be able to afford to live without credit for 6 years so need to account for all annual and irregular expenses including things like washing machine replacement, car repairs, presents for DC, school uniforms etc etc. Also small sundries like batteries, light bulbs etc, which can be part of your grocery budget, which can be reasonably generous - if you've struggled with debt for a while, chances are that you've cut right down on food to try and keep up with debt repayments, so will probably be allowed to spend far more on groceries than you're used to.
Have a look at this forum:
forums.moneysavingexpert.com/categories/iva-dro
Look out for the threads where people post their budgets and people advise on tweaking them before submitting them officially. Yes, there is an element of 'how much can I get away with' but as indicated above, you have to live without credit for 6 years and you aren't expected to live like a church mouse, you're allowed reasonably normal expenditure. Don't forget that food and energy has increased a lot over the past year.