Ian,
The comprehensive car insurance policy that you have insures you only. If you want to teach your son in your car, then he will need to get insurance cover as well. You have three choices:
- Add your son as a named driver on your existing car insurance policy
- Get a provisional annual car insurance policy for your son
- Purchase short term learner insurance to teach him
The first 2 options can prove to be quite expensive and not many insurers like to provide cover for provisional licence holders. If you are interested in the 3rd option, then there's only one company at the moment which will do that for you - Collingwood Learner Driver Insurance - A minimum of 4 weeks insurance needs to be purchased though but afterwards you can renew it by a week if you need more cover. The insurance will also be in your son's name which means your no claims discount will be unaffected if your son needs to make a claim through the insurance company.