@Monoxide
you would need £3,000 per year extra. To get this from an annuity, you would need a pot of about £90,000
I don’t understand this. You’d have to get £3k per year for 30 years in order to get back the £90k. So surely you’d just be better off with the £90k in the bank and spend £3k per year? Otherwise you’ve put in more than you’ve got out? Ditto the pp who said you’d have to save £1m to get £35k per year - surely you’re better off with the £1m in the bank?!
You can't just take the £90k out of the pot and put it in the bank, though.
Well, you could, but only £22,500 would be tax-free. You'd pay tax on the other £67,500 (less any of your personal allowance left, but if you're receiving a state pension, that might not be much). So at 20% tax, you could lose £13,500.
Or, as others have said, you could draw down income from the pot, if your provider allows that (not all do) and the rest of the pot remains invested. But investments can go down (my pension pot is currently much smaller than it was some years ago).
So at least income from an annuity is reliable.