You can always simply add a third party to your existing policy to allow, say, a family member or friend to use your vehicle, but this isn’t always the best option if you want to save money and guarantee the highest level of cover.
For one, your no claims bonus will not be maintained if whoever is driving your car has an accident in it, and if they do, your premiums will increase the following year.
Since temporary insurance policies will invariably offer comprehensive cover, you can keep your peace of mind as well as your no claims bonus when lending out your car on this kind of basis.