Ok, we are not retired yet but we have worked out what we need to cover our basic expenses on our mortgage free home and its £1500pm including all regular bills, and food but does not include a car (which we have, holidays or gifts etc). So we could manage on that but it would be slim pickings for holidays away/christmas and gifting. We are lucky and my husband has a really good private pension, I do not.
If I was single, the small private pension would negate any chance of universal credit etc and I would actually be worse off than if I I hadn't invested into my private pension. As it is, if my husband dies before me, I will get some of his pension and I will be OK and vice versa because he has a good pension.
For a married couple in 2025/26 the full weekly state pension is £460.50 per week combined or approx £24,000 per year or £2000 per month - as a couple its doable, its when you are single or have dependents that it becomes a real problem.
And if you don't have savings and you need a car, new boiler or other expensive like house maintenance, that is where the issue arises. Particularly if its an unexpected repair. This is what cripples people.
If you are single and £230.25 per week, and becoming fragile and can't afford help around the house then things are going to start going wrong and become neglected. Older houses cost more to heat and as a pensioner your bills may rise substantially because you are at home all the time. Can you afford to smoke/drink, have pets (we don't). There are so many variables.
I know a fair few single elderly people who have sold their homes and gone into rented accommodation as they cannot keep up with maintenance, the house falls into disrepair, the bills go up and emergency repairs that they cannot fund, are needed. When their house sale money runs out they get benefits int heir rented home. But again that depends where in the country they are and how easy it is to get affordable rental accommodation.