The Verderers? Courtroom in the Speech House
http://www.deanverderers.org.uk/verderers-court-room.html

On the east wall lie the two royal spades used in 1957 by HM Queen Elizabeth II and HRH Prince Philip to plant two oak trees over the road from the courtroom. In the Courtroom are the Verderers? brass plaque of the Royal Coat of Arms and the card advertising the Court proceedings.