Have you got a defined benefit pension (final salary or fixed pension with increases mostly built in) or a defined contribution pension where the pot is yours to do what you want.
I had a defined contribution but took action to get control of my pot because like you I’d have to live until my mid 90’s to start making a profit, in my case the pension wasn’t index linked and had no provision for an annual increase. It took me a long time and you need a registered IFA who has the indemnities to deal with the issue. There’s a lot to it and it ain’t cheap, probably cost you around 7k but it’s worth it and you can pay out of the crystallised pot meaning the fee comes out of your pension before any tax implications.
You have to use a FA for any amount over 30k, it’s compulsory for FCA regulations.
Once you have the money you can invest in funds, based on your attitude to risk your FA will choose for you. You can also draw money out annually any leave the balance to grow.
I finally got mine last July and it’s currently 12.7% up even with the Iran shit. I’ve not drawn anything out yet as I’m living on savings and investments plus state pensions for me and my wife, I estimate I only need around £6k per year to finance our lifestyle but our house is paid for so you may need more.
£4K per year for a £240k pot is too low, should be around £9k minimum from what I was looking at.
Try and transfer if yours is a DB pension but go and see a FA, it’s well worth it. I used Haven Protect in Altrincham, if you’re not local it doesn’t really matter as my meetings were on Zoom with just the last one in person, I can highly recommend them.