In the Telegraph. Quite long:
www.telegraph.co.uk/news/2022/04/11/christian-group-prepares-legal-challenge-conversion-therapy/
"Christian Concern’s legal challenge would involve an application for a Declaration of Incompatibility under Section 4 of the Human Rights Act as a ban would infringe freedom of the individual to exercise personal autonomy rights.
It would also raise questions about compatibility with other Articles of the Convention, including Article 9 which guarantees religious freedom, claiming that any legislation banning “conversion therapy” is in breach of the European Convention on Human Rights."
And:
"Christian Legal Centre lawyer, has questioned the lawfulness of the proposed ban.
He said that: “The new law addressing ‘talking conversion therapy’ would have significant legal and social consequences, particularly for those who have legal capacity and desire counselling, for their own reasons, to move away from same-sex attraction or behaviour, or to reconcile their gender identity with their biological sex.”
He added: “A ban could also affect practitioners caught up in an overly broad or ill-defined ban on ‘conversion therapy’, despite practising within a peer regulated and ethical framework. This could give rise to claims under Protocol 1, Article 1 of the European Convention on Human Rights.”"
And:
"chief executive of Christian Concern, said: “Whatever is announced by the Government in May, the problems remain: the definitions are inadequate, human rights will be breached and there is no evidence that a ban will help anyone.
“In such a scenario we will face no alternative but to pursue legal action against any proposed legislation in this area.”
Ms Williams added: “The Government is being strong-armed by manipulative campaigns rather than following its own research that further legislation is not needed.
“The fear of upsetting privileged lobbyists runs so deep the Prime Minister capitulated within hours.
“No one has produced any evidence of what LGBT activists call coercive ‘conversion therapy’. What the activists describe would already be illegal.
“The Government’s proposals would only stop people seeking the change they want to see in their lives. That is a basic freedom which the Government should not try to take away.”"
A ban does often seem impossible to legislate for. Aggravating features of existing legislation might have been an option for LGB (such as coercive rape of lesbians) but so much of what was proposed is already illegal. It seems very hard to separate out what is not covered, and ban it. And to do that without impinging on free speech at least, since religious freedom is a qualified right.