Do you really think everyone has savings in the bank incase of what if?
No, but when they loose their job they end up in the shit. Which you know.
Besides which, you have lived at home until you are 30. You have had the ability to not have debt. You have had the ability to save.
You have the ability to clear debt and save up. You are just choosing to strong the debt out as much as you can.
Even with your living cost estimate of just over £400 per month, add on your debt repayment and the car and you barely anything left. And you maths on what you outgoings would be are wrong.
You have found 1 cheap flat. In a shit area, that's going to cost a fortune to heat. If you can't save now, how will you save to move to a better area? When your child starts school?
Where are you getting the money to furnish the flat? You need to save money to move wether it's a ha house or not.
You have had loads of opportunity to have a decent credit rating and savings. You havent managed your money well for years.
The problem with that is that there are always cinsquences. That's what you are dealing with now.