The information is not available in the format requested. The NTA report, “Substance misuse among young people: The data for 2008-09”, gives figures on numbers of young people (under-18) in drug treatment according to whether each drug type is categorised as the primary or additional substance used as follows:
Drug type Primary Additional Heroin and other opiates 547 204 Cocaine 745 2,305 Crack 110 304 Ecstasy 210 1,429 Cannabis 12,642 4,811 Amphetamines 229 887 Alcohol 8,799 7,248