In reply to Toerag:
> My other half is off to stay with her folks in Germland for the summer and doesn't have a date of return planned as the situation with covid is so variable planning is a waste of time. Will travel insurance companies offer insurance on this basis? I've come across individual trip duration limits in the past for multi-trip policies, but never had to buy open-ended travel insurance before.
I'm not an insurance expert - but I'm sorry that I cannot imagine a travel insurance policy without an end date on it: I think that is extremely unlikely to impossible to get. What could you say to the insurance company - "Please give me insurance to whenever I come back?"
So what I would do is [1] phone travel insurance companies and ask them; when that didn't work (as I predict), I would [2] work out the latest date I might return and buy an insurance policy up to that date (remembering that in the case of annual cover, there are usually a "maximum days per trip" and "maximum number of days out of the UK per year" clauses)
Good luck, and hope you can work it out