That's good news. PLI is frustrating - I have been involved with many groups which have had to sort this out since the early 90s (which is when councils etc stopped providing it for their premises). The cost to small groups is horrific (especially if you're not able to buy into a collective type scheme). The need for it also deters those who are inexperienced or unfamiliar with the process. The end result is fewer community groups and activities all for the sake of saving a few pounds on the council's insurance bill (which we pay for through taxes anyway).
In all of my time with local and national groups, running to membership totals of thousands, I have never encountered anyone who has had to make a claim. This tells me that it is RARE. However, sometimes things do go wrong, so we have to have it.
I believe this is another aspect of the insurance industry which needs investigating as it has in effect become compulsory, which means that the market is immediately distorted (as it is with motor insurance) and so not operating in the interests of the consumer. Another aspect of the law of unintended consequences...