http://www.bbc.com/news/uk-england-39179504
“We saw health benefits for the individuals, we saw needles being taken off the street, so there’s an awful lot of evidence both in the UK and across the world that such schemes do actually work.
A Home Office spokesman said there was evidence “supervised use of [diamorphine] in a medical environment as part of a treatment plan can help keep patients in treatment and out of criminal behaviour”.