I have been involved in child welfare through sport for many years. Every adequate Child Welfare policy emphasises one key point...
If you become aware of an allegation of child abuse you WILL contact the police or social services. If a child doesn't want you to contact the police you will still contact the police. You should also inform the child welfare officer of your local club or national sport governing body. However this is secondary to your requirement to inform the police or social services.
The Child Protection in Sport Unit has the (financial) support of Sport England
https://www.sportengland.org/our-work/national-partners/child-protection-in-sport-unit/
The CPSU has procedure flowcharts outlining the safeguarding reporting procedures for
1. About the behaviour of the organisation’s staff member or volunteer
2. About the behaviour of another organisation’s staff member or volunteer
3. About children and young people arising out of sport (e.g. within the family at home, at school or in the community)
Looking at the WT's 2012 Policy (Section 8) - it would seem that WT is effectively calling the Elders in the individual congregations 'members of staff', and the trained 'Safeguarding Elders' at the Branch Office, the 'Safeguarding Lead Officer/s'.
https://thecpsu.org.uk/resource-library/2014/outline-safeguarding-reporting-procedure-concerns/
https://thecpsu.org.uk/download/media/2473/outline-case-managament-flowcharts-final-oct14.pdf