That sounds really hard OP, as most others have said it sounds really tight. I know it’s already been mentioned but there are so many things in life outside the very basics to afford - occasions, savings, unexpected appliance replacements or car maintenance.
Also if your income is already that low and is fixed - it’s worth noting that costs of living are rising quite fast these days. With Brexit coming people are anticipating the price of even basic food to go up. Even though it’s still theoretical there aren’t plenty or future scenarios that could result in the same. You rent did you say? What if you need to find a new property?
Your DH working full time is not an option you say - can he work part time, does he already? If he does could he find a wage increase somewhere? For instance even if he does unskilled work, switching to a night shift would earn him a couple of extra pounds an hour.
It’s hard to advise unfortunately without knowing your current sources of income or fill price of any necessary outgoings.
For instance with me and my 2 small children I could do £800 a month after rent and bills easily and with plenty of money to do nice things and have little luxuries - but that’s because I don’t drive or spend really any money on transport. Even a bus ticket for the whole month would only cost max £70, I think it’s £60 actually.
I know you say these have to be your circumstances, you definitely need your car etc., but frankly I’d be looking at making some pretty big sacrifices to ensure I had enough to see you through and make sure life is enjoyable and not a constant stress and struggle. Also don’t underestimate the impact on wellbeing of long term financial stress. Could you find a job closer to work or cycle so you didn’t need so spend such a big chunk of your £800 on a car?
Also make a list of nice and full filling things in life that are free or cost a minimal amount to balance out your tight budget -
- Nice walking routes
- Going to the library and picking out books
- Museums
- Drawing or painting if that’s your thing
- Taking photos, making collages etc
- Studyig even? With a student loan if your income is that low you’ll never be paying it back; the OU is fantastic. If your DH can’t work and is also short of money it might be a nice thing for him to do.
Good luck anyway. I hope your circumstances improve 