We never thought about what to do in situations like this as well. Basically the messages I have seen from the cycling community "WarmShower" has been great. Some people have offered their home/backyard/barn to accommodate stranded cyclists in some of the European countries that are in current lock-down.
Our trip to the UK has finished - but the blog hasn't caught up yet. Been busy settling down in London, but hopefully get back into full swing and involved with TravelFeed
Very glad to hear you found somewhere to stay though :))