4. If I take out comprehensive cover I automatically get ‘driving other cars’ cover, meaning I am covered fully comprehensively on any car I drive with the the owner’s permission
Most policies will only provide this benefit in certain circumstances and may not offer it for a number of reasons.
Even where such cover does exist it only applies third party.
So if you are involved in an accident in another car you could be liable for your own damage, which could prove very costly