P210 ORACLE 210 Fri 4 Feb ITN 2100:00   PUBLIC WARNED ABOUT TEA  A brand of herbal tea on sale in Britain could be a killer, Health Department officials warned tonight. Comfrey Tea, sold loose or in packets by Cotswold Health Products, has been found to contain the poison Belladonna, — Deadly NightshadeN Four people have already become ill after drinking it. People who drink the tea could develop symptoms including vomiting, a dry throat, difficulty in focusing and a rash, and should see a doctor.  For details of bargain price train travel see BRITISH RAIL index p125