Table 2.

Organising codes and thematic categories on positive and negative impacts

Thematic category	Organising code
Peer recruitment, training and support	Training and support mechanisms
	Recruitment and selection
	Retaining peer deliverers
	Payment and privileges
	Motivation for the role
Organisational support	Partnerships
	Institutional ‘buy-in’
	Funding and resource
Prisoner relationships	Providing practical support to prisoners
	Dependency
	Role tensions
	Awareness and utilisation
Prison life	Power and risk
	Contribution of peers to wider prison workforce and service delivery
	Impact on prison ethos and culture
	Peer interventions contributing to prison performance targets
	Integration of peer interventions into the prison
	Location of intervention
	Intervention arrangements and monitoring