driving other vehicles extension

Apologies if this is covered elsewhere but I couldn't find it.

Anyway, cutting a long story short, my father has offered me use of his car. I need to know if I am actually insured to use it. The car in question has fully comp insurance. As do I. The only reference I have managed to find in the documents I have says this.

"The driving of other cars extension is not included for any driver named on the policy".

Now I have read this in two different ways.

1. I simply do not have the driving other cars extension, therefore it would be illegal for me to borrow my fathers car
2. Named drivers on the policy aren't covered but I, being the policy holder, am covered by the driving other cars extension

Any insight or clarification on which interpretation is correct would be greatfully received.

That's the first option

I was going off elsewhere on the policy I am considered the Policy Holder, and named drivers are just that, named drivers. It just seems to be written ambiguously. Of course I am probably just reading into it what I want to read.

I was reminded of this by a colleague in work today. So that will probably be my solution. Ringing the insurer now.