Aside from UK business insurance, for e.g. travel insurance which does cover FCO advice to not travel - I don't think they're going to be able pay out every claim, I just can't imagine they've prepared for a near-total shutdown of the global tourism industry.
The message being promoted by UK Hospitality the past two weeks that insurance will pay out is incorrect. Same goes for other trade sectors.
https://www.lfgss.com/comments/15153875/