http://www.soca.gov.uk/orgCrime/index.html
"Organised crime covers a very wide range of activity and individuals involved in a number of crime sectors. The most damaging sectors to the UK are judged to be trafficking of Class A drugs, organised immigration crime and fraud. In addition, there are a wide range of other threats, including high tech crime, counterfeiting, the use of firearms by serious criminals, serious robbery, organised vehicle crime, cultural property crime and others."
Drug Trafficking
Organised Immigration Crime
Individual & Private Sector Fraud
Money Laundering
THE UNITED KINGDOM THREAT ASSESSMENT OF SERIOUS ORGANISED CRIME
PDF - http://www.soca.gov.uk/assessPublications/downloads/threat_assess_unclass_250706.pdf