Concerns as cross-sex hormones available online for just £11 a month

Experts fear children questioning their gender may turn to hidden economy to obtain hormones illegally

Cross-sex hormones designed to masculinise or feminise a person's body are available to buy online for less than 11 a month, with experts warning that growing numbers of under-18s may turn to the medicines hidden economy.

Last month the landmark Cass review of children's gender treatment in England concluded there was a lack of reliable evidence supporting the use of cross-sex hormones and puberty blockers by young people questioning their gender identity.