thecpsu.org.uk/resource-library/best-practice/abuse-in-positions-of-trust-in-sport-and-activity/
You can seek advice from the NSPCC helpline on 0808 800 5000.
"What is a position of trust?
Someone in a position of trust is a person in a position of authority or responsibility over another person. Those in positions of trust have a considerable amount of power and influence on a young persons’ life. For example, a young person may be dependent on their coach, mentor or other adult for their sporting development, success, or position in a club, representative or national team.
Those in authority positions in sport can have a positive influence on the welfare of a young person, by providing role models or someone to turn to if they have a concern.
Clear boundaries and maintaining boundaries
"But it is important to have clear boundaries in place for the safety of both the young people and the staff, to ensure exploitation cannot take place.
Safeguarding training for those working with young person in the sport sector should include material on the issue on abuse of trust guidance on maintain[ing] appropriate boundaries between adults and young people."
"What can sports coaches and others in positions of trust do?
As someone in a position of trust, you have a responsibility to maintain a positive, healthy relationship with the young people under your authority.
Ensure that you read, understand, sign up to and comply with the code of conduct/behaviour your club, organisation or relevant sport’s governing body has produced for the role you hold
Maintain a relationship with all participants that is appropriate to your role and reflects positively on the club or organisation you work or volunteer for. Relationships between those in positions of trust and young people in sport should be supportive, positive and aimed at improving the young person’s skills, and progress.
Whether or not the code explicitly refers to positions of trust (and what would constitute breach) as someone in a position of authority you should not seek to or engage in sexual activity or sexualised communication or image sharing (including via social media) with 16- or 17-year-olds for whom you are responsible.
If you think that a young person’s behaviour indicated that they are seeking to develop or engage in an inappropriate relationship with you, immediately bring this to the attention of your club or organisation’s welfare officer, designated safeguarding lead or manager. Be careful not to respond to the participant in any way that could be interpreted as encouraging the young person concerned. Make a written record of your concerns and relevant details."