If you have enough ongoing pension income, then what is this money intended for?
Holidays?
House maintenance? New kitchen/getting everything as you want it before old age/ill health? Cash flow to support downsizing?
Paying for something in the future eg kids wedding?
Your goals plus your timeframe will determine what is the best solution for it.
Anything for 5 years or less, just get on with doing those things or put it in premium bonds/low risk investments. Inflation will eat away at this though, and Inflation is high. This is a guaranteed loss in spending power.
Anything for longer than this, or undetermined, I would put in S&S ISAs. I know it's just dropped, but it will come back again. You only realise those losses when you cash out, so as long as you don't need to cash out you should be OK longer term. Hold your nerve! These losses are only on paper so far.
But if you don't need it for anything, if you definitely have enough, then I would seriously ask yourself what you are saving for. There are no pockets in a shroud, we can't take it with us. Seriously consider spending it, have some good holidays, eat some phemonenal meals, buy the cashmere slippers, "make memories". Also consider giving it away to charity or to people you know to whom a bit of money would make a significant difference. That can also be very pleasurable in its own way.