Aha the Urban Myth!
Funnily enough I was talking to Swinton insurance yesterday & the lady there said that they have a lot of people who think that!! I asked her if it used to be the case & things have changed, but she said not.....
Carrying on from that, although I only have 3rd party, fire & theft insurance on my Puma, I CAN drive another person's car with their permission & a few other things stated in my schedule BUT she went to great lengths to point out that this was designed to be an 'emergency' type-of-thing and that if I crashed the other person's car then I would be liable to pay for the damage to THAT car, even if the person had fully comp on the car (although damage I caused to a 3rd person or property WOULD be covered... same as with my own car)
Obviously it's a different matter if the person whose car you borrow has an 'any driver' policy...yeah, I know, stating the bleedin' obvious!
Anyway, this maybe of mild interest to someone, if they managed to stay awake until now!
And the moral of the tale: check the small print on your schedule/policy