PROMETHEAN World has said that it is likely to post an operating loss of several million pounds for the first half of its financial year, which it blamed on lower-than-anticipated sales of its interactive teaching equipment.The Blackburn-based company said that orders at that start of its key buying seasons in the US from June to September had "not materialised at the levels anticipated"."Revenues for the first half of the year are therefore now expected to be in the range of £80m-£85m and, with gross margins lower than......for the full story register now for free or login below...