Anyone driving their own car as part of their duty period, ie. for your own or your employers business, had better check their insurance policy. Most people only have 'social, domestic or plesure' limitation in their policies. If you are asked to drive from your home base to another base to operate, whether for one flight or for a period of sveral days, you are operating your car for business purposes and your own insurance probably does not cover you.
Also, if using a hire car, make sure that the insurance covers you when driving on behalf of the company. Most policies, again, do not cover you. Your employer is duty bound to have in place a policy that covers you if you do ANY driving on behalf of the company, whether your own car or a hire car. Make absolutely sure that you have seen the company policy that covers you and make sure that it has adequate cover. Nothing worse that having a prang or worse with your own or someone elses car and finding out that you are not going to be covered. And you thought you were helping out your company?
Travel from home to your regular place of work is fine but as soon as you are driving on company time your insurance policy usually stops covering you. So, make sure that if you are self positioning you are insured AND that you can finish your rostered duty period without discretion.
The naivety of some posters on here beggars belief sometimes! If you think an insurance comany or your own comapny will feel sorry for you if you have an accident and you didn't make sure you were insured then you probably also believe that pigs might fly!