In the same week as Louis Theroux’s documentary Transgender Kids hit our screens, the Tavistock and Portman NHS Trust, the UK’s only centre specialising in gender identity issues among under-18s, revealed that referrals to its services have quadrupled in the past five years. The number of under-11s referred to the unit has risen from 19 in 2009-10 to 77 in 2014-15.

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