Logitek Plc requested the Stock Exchange to suspend trading on its shares after the value fell by 20 pence to 56 pence: the company believes that the reason for the fall is a research report published by brokers Henry Cook which downgraded profit expectations for the year to March 31 to UKP3.8m from UKP5.2m; Logitek, due to report interim results, says it will make an announcement next week that will clarify the situation; the company also stresses that the report was written independently of Logitek.