Most companies offer three types of insurance cover Comprehensive, Third party fire and theft and third party make sure you choose the one that suits your needs best. However cars valued at over £5000 normally can only be insured on a comprehensive policy.
It's a common misconception that having fully comprehensive insurance means you can drive any car. Unless your insurance states you're allowed to drive other cars then you cannot. when purchasing your next car insurance policy, check to see if you can drive someone else's car.
When making a claim have as many details with you as possible including your policy number and a crime reference number if you have one.