LANCASHIRE education technology company Promethean World said it had seen a strong first half as it continued to make a promising start to life as a listed business.The Blackburn-based group said first half revenues had surged 35% to £122.4m in the six months to June 30.  In volume terms, Promethean sold approximately 89,500 interactive display systems and 596,000 learner response system handsets, increases of 29% and 24% respectively compared to the same period last year.The average selling price for interactive display......for the full story register now for free or login below...