Sherwood Computer Services Plc says that as a result of difficulties in the Lloyd’s of London insurance market and of the uncertainties surrounding local government financing, profits for the first half of 1993 will be substantially below those for the same period last year, but that while it is still too early to predict the outcome for the full year, it expects an improvement in trading in the second half of 1993 and a satisfactory result for the full year; the results for the six months to June 30 are expected later this month; the news banged the shares mercilessly and they fell 53p at 155p.