I'd like to ask Gaint just exactly where he gets his figure of "the 300,000 drug addicts on incapacity benefits, those who have contributed least to society" but I think it is probably all too obvious

"350,000 heroin and crack addicts claim a staggering £1.6bn in benefits"
By Daily Mail Reporter

This seems at odds with a statement by Chris Grayling (Minister of State (Employment), Work and Pensions; Epsom and Ewell, Conservative) in Written answers and statements, 20 July 2010

"Drug and alcohol addiction is one of the most damaging root causes of poverty, and helping people who are trapped on benefits through drug and alcohol addiction so that they can recover and find employment is a top priority for the Government.

....we do have data for incapacity benefit and severe disablement allowance where the main disabling condition is listed as drug abuse. We also have estimates for the number of working age claimants who are problem drug users in England.

Incapacity benefit and severe disablement allowance claimants with the main disabling condition of drug abuse As at November:
2005 48,200
2006 49,080
2007 51,220
2008 49,790
2009 41,230 - rounded to the nearest 10

Drug or alcohol dependency does not of itself confer entitlement to incapacity benefits.
To qualify for incapacity benefit/severe disablement allowance, claimants have to undertake a medical assessment of incapacity for work. This assesses the effects of a person's condition on their ability to carry out a number of everyday activities relevant to work.
People with a recorded diagnosis of alcohol or drug dependency may have other diagnoses, for example mental illness, which result in their incapacity for work.

Causes of incapacity are based on the International Classification of Diseases, 10th Revision, published by the World Health Organisation:"