No. Because we won't be able to track your mileage while you use other cars, you'll only be insured to drive the car noted on your Policy Schedule.
If you want to drive someone else's car temporarily, you'll need to be covered under another insurance policy from elsewhere.
There are many providers of temporary insurance if you need it.
It's worth noting that while some policies include cover for driving other cars, it's usually on a third-party only basis that's designed for emergencies.