Johnston Press revenue down 8.2%: Johnston Press, publisher of The Yorkshire Post and The Scotsman, saw revenue fall 8.2% in the half year, amid declining print advertising and newspaper sales. The Questor Column: Petra remains a gem despite production setback: Petra Diamonds shares have plunged in the past few weeks, underperforming the wider mining sector significantly. The company lowered its expectations for the year to June 2013, saying it now thought it would mine 2.85 million carats, a cut of 250,000 carats.