OP,
£100k at 42 is a good start. You’re doing better than most people, which is a mixture of lots of luck and a bit of planning on your part.
I personally had £242k at age 39 in my pot when I was disabled in seconds in an RTA and have not worked a day since, nor will I ever be able to work again. The pot has had zero contributions to it since then and is currently hovering around £388k (it’s invested so has gained value with the investments). I am 49 yrs old now.
My pot is 100% from my wages, there was no inheritance or windfalls of cash. I simply started saving aggressively from my first graduate job aged 24 by putting away 25% of gross income. I never missed the income because I went from skint student doing low paid BS jobs to graduate earning a decent wage. So I still had more take home pay.
If I’d been able to keep contributing to my pot, it would likely be over £1m by now. As that was “the plan”. But I’m so glad I saved when I could as it’s probably how I’m going to fund getting back on the property ladder with a retirement home. The RTA created a financial crisis for my family and we ended up having to sell our home and are back to private renting.
However, you are fit and healthy, working and contributing. So this pot will likely grow quite a bit by retirement age (touch wood you don’t get disabled). I am assuming of course your pension pot is invested in some form? It’s not a savings account is it? If it is, consider opening and putting it in a SIPP.
I think you are in a good shape for your age.