Tricorn Group, the AIM-quoted tube manufacturers, has revealed that group profit before tax for the full year ended March 31st will be ahead of market expectations. The news comes after the firm made an 'encouraging' start to the final quarter with demand remaining strong and operational performance continuing to improve. Operating margins in all three of the group's divisions are anticipated to be ahead of first half performance.The profit before tax figure is before intangible asset amortisation, share based charges and fair value adjustments.Shares were up 6.87% at 35p in afternoon trading.NR