The Metro reports it like this. I'm not sure what this means for how easily under-16s will be able to consent ...
Trans teens under 16 can get puberty blockers if they understand treatment
metro.co.uk/2020/12/01/trans-teens-under-16-can-get-puberty-blockers-if-they-understand-treatment-13681661/
"Trans children under the age of 16 can only consent to puberty blockers if they understand the nature of the treatment, a High Court has ruled. In a judgement made today, Dame Victoria Sharp – sitting with Lord Justice Lewis and Mrs Justice Lieven – said that children under 16 needed to understand ‘the immediate and long-term consequences’ of puberty blockers before they receive them.
She described a child’s ability to give ‘valid consent’ as being able to ‘understand, retain and weigh’ a number of factors involved in the treatment.
These would include understanding ‘the immediate consequences of the treatment in physical and psychological terms’, and the fact that ‘the vast majority of patients taking puberty blocking drugs proceed to taking cross-sex hormones’, meaning they were a ‘pathway to much greater medical intervention’, she noted.
Dame Victoria also said children would need to understand the impact of the ‘treatment pathway’ on ‘future and life-long relationships’, and be aware of the ‘unknown physical consequences of taking puberty blocking drugs and the fact that the evidence base for this treatment is as yet highly uncertain’."