Inheritance and UC deprivation of capital

Good evening,
I know you won’t be able to give me a definite answer but you could maybe suggest if you think this is reasonable.
Im due to inherit around 25k ish In the next few months.
I have around 5k ish owing to car finance and other accounts plus an overdraft which I hope to pay off.
Also,My current car is a mess, it’s growing mould (which isn’t safe for my child but I have no choice) it has driven around 120,000 miles and has cost me thousands to fix up in the past year! And the insurance keeps going up!

I want to buy a new (not actually new) car, I’m looking at a Peugeot 208/308, they are smallish sized, cheap to insure and run and I need something reliable. I am a student nurse and work in the hospital and I am the main carer for my toddler and disabled partner so a reliable car is essential! If I spend 10-12k
on a car (this is for a 4 ish year old one with low ish mileage and warranty) would they penalise me for this? As paying this amount plus paying off the money I owe would bring me below the benefits threshold I’m worried they will not like this .
I know nobody can really answer of they will accept this as appropriate use of money,but from experience do you think this would be accepted? Or am I wishing too much. I don’t want to be penalised but I also need a functional car that can fit my partner, has isofix for car seat and can fit a pram in the back.

Thank you!