Wendy,
It is implied that when you take car insurance, you have a valid driving licence. Since your husband's licence has been revoked by the DVLA on medical grounds, he will not be able to get insurance in his name. Therefore you have the following options - you can change the insurance policy so that you now become the policyholder instead of your husband and use the Land Rover or you can cancel the insurance policy for that particular car.
If your husband needs to be transported in an adapted car, then you will have to keep the Land Rover to drive him but if he can travel in your car, then it would be easier to just do that.
