You will need a two pronged attack, first minimise expenditure and then maximise income.
2 cars on one part wage isn't sustainable, one will have to go (maybe both depending on distance to work/school and public transport).
The phone prices seem very high, I pay half of yours and get unlimited calls/texts and 36gb data.
I would contact the companies you owe money (either directly or via a debt advisory service) and work out manageable payments.
Meal plan, budget for all expenses and prioritise the non negotiable bills (such as council tax).
You should also look for a full time job. Your DH... well that depends, is he is not well enough then he cannot, however if he is well enough he should look too. However you cannot get the job for him, he has to be well enough to look himself.
Once you are back in your feet I would pay down the debt as quickly as possible. £600 a month on debt repayments (that don't include a mortgage or car payments) is really high, even in 3k/month.