In What Car?'s postbag this week, we've had queries about diplomatic cars, surfer's wheels, secure accounts and repairing write-offs.
Click here to submit your own question. We publish a selection of answers here every week. Please be aware that we are inundated with questions and can't promise to reply to every one.
If there are any terms you don't understand, click here to see our glossary.
If you're after advice on which car to choose, remember to tell us what your budget is and what your buying priorities are. Tell us if you're more interested in economy than performance, for instance, and what you'll use the car for.
Don't forget you can also turn to the What Car? Helpdesk with motoring problems or disputes you might be having. Click here to e-mail the Helpdesk.