Key word there is child. Yes, for under 16s there aren't many ways without parental consent to support them.
Anyone under 18 years old in UK is legally a child.
"NSPCC
Definitions of a child
The United Nations Convention on the Rights of the Child (UNCRC) defines a child as everyone under 18 unless, "under the law applicable to the child, majority is attained earlier".
England
In England a child is defined as anyone who has not yet reached their 18th birthday. Child protection guidance points out that even if a child has reached 16 years of age and is:
living independently
in further education
a member of the armed forces
in hospital; or
in custody in the secure estate
they are still legally children and should be given the same protection and entitlements as any other child (Department for Education, 2018a).
Northern Ireland
In Northern Ireland the The Children (Northern Ireland) Order 1995 defines a 'child' as a person under the age of 18.
Scotland
In Scotland, the definition of a child varies in different legal contexts, but statutory guidance which supports the Children and Young People (Scotland) Act 2014, includes all children and young people up to the age of 18. Where concerns are raised about a 16- or 17-year-old, agencies will need to consider which legislation or guidance is appropriate to follow, given the age and situation of the young person at risk
Wales
Section 3 of the Social Services and Well-being (Wales) Act 2014 states that a child is a person who is aged under 18."
learning.nspcc.org.uk/child-protection-system/children-the-law