A bit stable door after the horse has bolted but worth bearing in mind for next time.

Our daughter wanted use of our car for a few months whilst we were away. Temporary cover was very expensive (as you have found) - but adding daughter as a permanent additional driver was ~£30 for a full year. Daughter - age mid 30s, lives west country.

Another point - we have visitors driving from Spain. Whilst most UK policies still include the EU in territory covered, it seems the Spanish (and possibly the rest) restrict insurance to the EU which no longer covers the UK. They had to find separate insurance.

I have just paid £37 for 3 days (72 year old, EU licence driving my father's 15-year old Peugeot Partner). Normally it's a longer period, and from what I've seen the cost per day goes up for longer periods. And you'll find that a large proportion of the cost is not insurance but the Tempcover "fee".

For some years my father was insured with LV, and they would insure me for any period for a £15 admin fee, but unfortunately they got too expensive for him and he moved to a less obliging company.