PM defends his actions over the appointment of Mandelson.
Prosecutors say he could face life in prison due to special circumstances surrounding the girl's disappearance and death.
A 29-year-old woman is charged with attempted murder, GBH, dangerous driving and drink driving.
The PM tells the Commons that if he had known the peer failed security vetting he would not have been appointed.
Formula 1 makes a series of rule changes to address concerns about the new engine regulations that were introduced for this season.