Would you qualify for a mobility car? That would save you some money. Have a look at the scheme online. You get a new car regularly.
Before lockdown I would drive about eleven miles a day and then be out at the weekend for a drive. Petrol cost then was about £120 per month.
Insurance depends on where you live, your age, and what kind of car you are insuring. You could get a quote now, just make up the date you passed your test as being this year in February say and that will give you an indication of what you will pay. Mine is about £50 a month.
Repairs, servicing, MOT and tax for a ten year old small car I allow about £50 per month.
RAC or other breakdown £14 per month.
Any parking permits you require.
If you are on getting an insurance quote you can try putting in different cars and see how much that affects ya your premium. Also try putting your friend or mum on it as that can reduce the premium too (even if they will never drive your car ever).
If you don’t want to buy and want to ‘rent’ it’s generally about £150 upwards. I don’t know if that includes servicing or parts etc so you’d need to ask. I don’t think it includes insurance.
If you rarely use perhaps being a member of a car club may suit better?