Thomas Schreiber of Gullingham, Dorset, also filed a criminal petition in Winchester Crown Court for attempted murder of his mother, Anne Schreiber, who was an associate of Sir Richard.
He also admitted to operating a dangerous Range Rover on the A303, A4 and M3.
Prosecutor Rob Welling told the court that the murder request was not acceptable to the Crown Prosecution Service and that the case would go to trial on November 29.
Judge Mr Garnham has since remanded Schreiber.
The following is more.