England’s Mental Health Trusts Struggle to Make New NHS Roles Work, Leaders Reveal

England’s National Health Service is facing one of the most severe workforce crises in its history, and nowhere is the pressure more acute than in mental health services, where demand has surged faster than the supply of qualified staff. In response, policymakers have poured investment into expanding the mental health workforce through the introduction of new roles, a strategy known as skill-mix change. These roles, including Peer Support Workers, Clinical Associates in Psychology, Educational Mental Health Practitioners, Mental Health and Wellbeing Practitioners, Nursing Associates, Physician Associates, Advanced Practitioners and Multi-Professional Approved Clinicians, were designed to relieve pressure on established professions and bring new capabilities into services. But a new qualitative study published in BMC Health Services Research suggests that the reality of implementing these roles is far messier than the policy vision, producing unintended consequences that ripple through entire organisational systems.

The research, led by Pauline Anne Nelson of the University of Sheffield together with colleagues from the University of Sheffield and Manchester Metropolitan University, set out to understand how workforce leaders in English mental health trusts perceive both the rationale for and the process of introducing new roles. Rather than measuring patient outcomes or counting headcounts, the team focused on the people tasked with making the change happen on the ground: the leaders who must reconcile national policy ambitions with local realities. Their findings offer a rare, system-level view of what happens when a large, complex organisation attempts to reshape its workforce while simultaneously trying to keep services running.

Methodologically, the study employed a two-phase qualitative design. In the first phase, the researchers conducted semi-structured online interviews with leaders from 31 of England’s 51 mental health trusts, a response rate of 61 percent, yielding perspectives from 33 individual leads. The sample was purposive, meaning participants were deliberately selected to capture variation in trust size, geography and implementation experience. In the second phase, the researchers convened three online stakeholder reflection groups involving 18 leaders drawn from provider organisations, policy bodies and professional bodies. These groups were informed by the Phase 1 findings and served as a mechanism for validating, challenging and deepening the initial interpretations.

Analysis followed a structured analytical pathway. The researchers used Template Analysis to code the interview data, building an initial framework of themes, and then compared that template against the domains of the Consolidated Framework for Implementation Research, or CFIR, a widely used conceptual model in implementation science. CFIR organises the factors influencing whether an innovation takes hold into domains covering the innovation itself, the outer setting of policy and commissioning, the inner setting of the organisation, the characteristics of the individuals involved, and the process of implementation. Mapping the themes onto these domains allowed the team to identify which factors exerted the strongest influence on implementation success or failure.

Three cross-cutting themes emerged from the data. The first concerned mental health trusts’ motivation for implementation, encompassing both the drivers that pushed organisations to adopt new roles and the concerns that made them hesitant. Trusts were motivated by genuine workforce shortages and by national targets tied to funding, but leaders also voiced anxieties about whether new roles would fit safely within existing clinical pathways, how other staff would react, and whether the investment would prove sustainable. This tension between external pressure and internal caution framed everything that followed.

The second theme described the challenging implementation context within trusts and the consequences arising from it, most of which leaders characterised as unintended. Skill-mix change, the study found, does not simply add capacity; it disrupts systems. Introducing a new role into a multidisciplinary team can unsettle established hierarchies, blur lines of professional responsibility, create confusion among patients and colleagues about what the new practitioner can and cannot do, and generate additional supervisory and training burdens. Leaders reported that these ripple effects were rarely anticipated at the planning stage, and that the workload of managing them frequently fell on already stretched teams.

The third theme captured the strategies that some leaders were deploying to support implementation despite these challenges. Rather than treating new roles as a one-off staffing decision, the most effective leaders approached implementation as an ongoing process of adaptation. They tailored communication to local teams, adjusted role definitions to fit service needs, invested in supervision and team integration, and built feedback loops that allowed problems to surface early. The study’s authors emphasise that this adaptive, multi-level work, spanning strategic, operational and relational dimensions, was what distinguished trusts that were making progress from those that were stalling.

One of the study’s most consequential conclusions concerns the CFIR domains themselves. The researchers found that the outer domain, the policy and commissioning context, was largely beyond the control of trust leaders, shaped as it is by national targets, funding cycles and regulatory expectations. However, all of the remaining domains, the innovation itself, the inner organisational setting, the attitudes of individuals, and the implementation process, were amenable to adaptation to some degree through deliberate implementation work. In other words, while leaders cannot change the policy weather, they retain substantial leverage over how change lands inside their organisations, and the study provides a map of where that leverage can be applied.

The implications extend well beyond mental health services. Evidence from outside mental health has long suggested that skill-mix change brings significant organisational challenges alongside its potential benefits, and this study confirms that mental health trusts are navigating the same turbulent dynamics, amplified by workforce shortages and rising demand. The authors argue that skill-mix change should be recognised as a process of adaptation and system change over time, rather than a discrete event that can be scheduled and completed. That reframing matters for commissioners and national bodies: if implementation is treated as a project with an end date, the slow, relational work of integrating new roles into teams will be under-resourced, and the unintended consequences documented here will continue to accumulate.

For a health system betting heavily on new roles to close its mental health staffing gap, the message from England’s workforce leaders is sobering but constructive. The investment is necessary, and the roles have real potential, but their success depends on sustained, locally tailored implementation effort that respects the complexity of the systems they enter. The study, funded by the National Institute for Health and Care Research under award NIHR152665 and approved by a University of Sheffield research ethics committee and the Health Research Authority, offers implementers a practical evidence base for planning that effort. As demand for mental health care continues to climb, the difference between a workforce strategy that transforms services and one that merely adds job titles may come down to exactly the kind of adaptive, multi-level leadership work this research has brought into focus.

Subject of Research: Implementation of new workforce roles and skill-mix change in English NHS mental health trusts

Article Title: The implementation of new roles in mental health trusts in England: a qualitative study of workforce leaders’ perspectives

Article References: Nelson, P. A., Long, J., Sanger, S., Hodgson, D., & Wood, E. (2026). The implementation of new roles in mental health trusts in England: a qualitative study of workforce leaders’ perspectives. BMC Health Services Research. https://doi.org/10.1186/s12913-026-15550-7

Image Credits: AI Generated

DOI: 10.1186/s12913-026-15550-7

Keywords: mental health services, NHS workforce, skill mix, new roles, implementation science, CFIR, qualitative research, health services research, workforce leaders, England, mental health trusts, health policy