The definition of a woman is based on biological sex, according to the UK’s most senior judges.  
  
As part of the decision, Lord Hodge, one of the judges, said: “We counsel against reading this judgement as a triumph of one or more groups in our society at the expense of another, it is not."  
  
Nevertheless, campaigners who brought this case to the courts cheered and hugged as the judges left the room.  
  
This episode hears from both sides of one of the most divisive debates in society and Niall Paterson speaks to legal commentator Joshua Rosenberg about the legal and social implications of the court decision. 

Producer: Soila Apparicio
Editor: Paul Stanworth