Q422: I am going to buy a car at an auction, is it ok if I drive it home and then get insurance?
No, before you drive any motor vehicle on a road you must have insurance. You should not drive the motor vehicle until you have insurance. You could even be prosecuted if you get insurance just before you drive the vehicle home but do not received the certificate from the insurance company for a few days (although unlikely).
If you have a motor traders policy, then this will cover you for driving any vehicles you have purchased in connection with your business (see your policy for exact details).