A British judge has ruled that a lawsuit by Prince Harry, Elton John and five other public figures accusing a tabloid publisher of unlawful information-gathering should go to a full trial.

It's rare enough to see a senior British royal testifying in a court of law.

Prince Harry has returned to a London court as his attorney fought assertions that the phone hacking lawsuits he, Elton John and other celebrities have brought against the publisher of The Daily Mail are based on forbidden documents.