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More than 300 transgender children a year are now starting on a course of puberty-blocking drugs, according to new figures seen exclusively by this programme.

The treatment, only available to under-16s on the NHS since 2011, is meant to pause the onset of puberty, giving children more time to decide if they want to live as another gender.

For the last four years we have been following two young transgender girls – Lily and Jessica – as they grow up in the UK.

Last month we spent the day at a weekend camp for transgender children, where we caught up with both of them again.