How do we change ownership of our car to our daughter?

My daughter is about to sell her car. I am going to give her mine. What is the sequence of change in ownership of mine, taxing it and insuring it in my daughter's name?

How do I change ownership on a leased car?

My vehicle is privately leased. What do I need to do with the DVLA if I wish to change ownership from company to personal? And what about the insurance company?

Is the simple act of merely retaining the V5C committing a criminal offence?

Is the simple act of merely retaining the V5C committing a criminal offence? I know about the pre-registered car and keeping the log book for three or six months by dealers. My dealer has a very good name...