You definitely are well off and privileged! What you might not be is well enough off to completely give up work at 52 and have no other source of income.
You're still in a vastly, vastly more secure position than the majority of the country.
It's also really worth analysing what you actually spend at the moment. I could live frugally on about 12k per year after tax, and very comfortably on 24k per year after tax. In fact that's about what I spend after tax currently and that pays for a cleaner, a gardener in the summer, an expensive gym membership and 4 or so holidays.
So actually, if you have low living costs and plenty of time, you may find you could live quite comfortably on the £1500 per month that others have been saying would be too painful.
Would it be worth trying out a frugal few months and seeing how it goes? There might be things you miss and things you don't.
Between that, a bit of part time work and drawing down just 4% of the 250k (put somewhere sensible like index funds or bonds depending how risk averse you are) you should have plenty to totally change your lifestyle, which is a massive achievement, even if it isn't full retirement. If you think that you've been working full time since the age of (say) 21, and you're now 52. That's only 31 years. Your life expectancy as a woman of 52 is 87 years, with a 25% chance you make it to 95. That's another 35 years - longer than you've worked! It's always gonna be tough to support a retirement longer than your whole career. It would be the same length as your career even if you had started full time work at 16.