Criminals in Britain are taking advantage of gunrunning from eastern Europe to obtain heavier firearms, according to research published yesterday. Police suspect that more potent weapons are arriving largely from the Czech Republic and the former Soviet Union, according to the Small Arms Survey 2003. The Europe-wide report, produced by independent Geneva-based researchers, cites the discovery of a mortar and heavy machine gun by the Metropolitan police in 2001 and warns of a trend towards greater firepower in criminal hands. "Instead of less capable revolvers, [criminals] increasingly have fully automatic pistols. Instead of hunting weapons, police are more commonly recovering...