If I give my car to a garage to sell, can someone legally drive it even though it's in my name and isn't taxed?

If I give my car to a garage to sell, can a garage employee legally drive it? Is the driver covered under the garage's insurance policy without displaying trade plates? Also, the vehicle is not taxed and...

What's the best place to sell a Caterham?

I'm looking to sell a Caterham Monaco. What's the best way to do so?

What are my obligations when selling privately?

What are my obligations when selling privately?