CLASH (Central London Action on Street Health) provides sexual health services for sex workers both on and off the street, homeless people, young people, drug users and men who have sex with men (MSM). It was based formerly in Soho and subsequently in Bloomsbury.
- http://www.cnwl.nhs.uk/service/clash-central-london-action-on-sexual-health/. CLASH website. Accessed: 2016-06-08. (Archived by WebCite® at http://www.webcitation.org/6i73FK8Iv)
- http://web.archive.org/web/20120826090322/http://www.lgbtconsortium.org.uk/directory/clash_central_london_action_street_health Archived page from the LGBT Consortium.