Sorry to hear about the redundancy.
The first £30,000 of redundancy payments are free of tax. You should only consider putting your redundancy payment into pension to the extent it exceeds £30,000 otherwise there is no tax benefit and you just lock up £30,000 into pension unnecessarily.
If your redundancy is less than £30,000 and you are looking for a tax shelter, consider ISAs instead. Your allowance for this tax year is £20,000 and after 6 April 2020, you have another fresh ISA allowance to play with.
As for whether your cash will go down a Covid Black Hole if you invest in equities (Stocks and Share ISA), very possibly. Depends on when you need to draw on this cash. A two year time line does not enable you to ride out the market but if you are prepared to lock up your funds for longer, you might make quite a bit when equities recover, if they recover.
Baron Rothschild: the time to buy is when there is blood in the street. You are going to need nerves of steel for this. Otherwise, best to put it into safer investments than equity. Apart from cash, I am not sure what it is.
Consult an IFA, of course.