Jayden Lowe, 18, who took his own life last year

For Tanya Carter, a mother of four girls, the death of Jayden Lowe, a transgender teenager who took his own life last year after buying hormone treatment from doctors online, was the last straw.

Carter had already begun to question some of the advice being given to children about changing sex when Jayden, 18, died.

He had attended the sixth-form college in Cambridgeshire where one of her children is a pupil.

“My heart breaks for the loss of . . . a truly special and talented individual with so much to offer,” she said.

Carter, a former chairwoman of school governors, has watched with concern as schools across the country draw up LGBT policies and guidelines. She said some are inviting specialist lobby groups to