Dua Lipa, Charli XCX and Elton John are among the stars who have signed an open letter to the government calling for a ban on “conversion therapy”.The practice is used with the aim of “changing an individual’s sexual orientation or gender identity, per The Trevor Project’s definition.“Conversion therapists use a variety of shaming, emotionally traumatic or physically painful stimuli to make their victims associate those stimuli with their LGBTQ identities,” the organisation says.