DISP: The Dispute Resolution Sourcebook Explained

Complaints Handling, FOS Jurisdiction and Root Cause Analysis Under the FCA Framework

DISP — the Dispute Resolution Sourcebook — is the FCA Handbook module that establishes how regulated firms must handle complaints. It defines what counts as a complaint, the procedures firms must follow when complaints are received, the timelines that apply, the rights of complainants to escalate to the Financial Ombudsman Service, the data firms must record and report, and the broader governance expectations around complaint root cause analysis. Combined with the FOS’s jurisdiction and the Consumer Duty’s Consumer Support outcome, DISP creates a substantial regulatory framework that shapes how firms engage with customer dissatisfaction and how that dissatisfaction is escalated and resolved.

This guide explains how DISP actually works in practice — the complaints handling framework, the eight-week resolution timeline, the FOS escalation process, root cause analysis expectations, and the integration with Consumer Duty and broader conduct frameworks. It also covers the recruitment dimension — the senior compliance leadership and complaints handling team capacity that DISP-compliant operations require.

What’s missing from most online explanations of DISP is the practical interpretation. The procedural framework is well-described; what’s harder to find is what good substantive complaint handling looks like, where the FCA’s expectations have evolved, and how DISP intersects with other recent regulatory developments. That’s the gap this guide fills.

The Structure of DISP

DISP is structured into chapters covering distinct aspects of dispute resolution:

• DISP 1 — complaints handling procedures for firms
• DISP 2 — jurisdiction of the Financial Ombudsman Service
• DISP 3 — complaint handling procedures of the FOS
• DISP 4 — standard terms (relating to FOS rules)
• DISP App 1-3 — appendices covering specific complaint types and historical issues

The most operationally engaged section for firms is DISP 1, which sets out the substantive complaints handling framework.

What Counts as a Complaint Under DISP

The DISP definition of “complaint” is broad. A complaint is any oral or written expression of dissatisfaction, whether justified or not, from or on behalf of a person about the provision of, or failure to provide, a financial service that:

• Alleges that the complainant has suffered (or may suffer) financial loss, material distress or material inconvenience
• Concerns a regulated activity, ancillary activity, or other relevant activity carried on by the firm

The substantive scope is operationally significant. The breadth means many customer interactions that firms might not internally treat as “complaints” actually engage DISP. Common scenarios include:

• Customer expressions of dissatisfaction in calls or emails
• Social media posts complaining about service
• Statements through customer-facing staff that go beyond simple service requests
• Communications from third parties (advisers, family members) on behalf of customers
• Statements during cancellation or claim processes that allege poor service or product issues

Firms whose complaints recording systems only capture explicitly-labelled “complaints” typically under-record under the DISP definition.

DISP 1 — The Complaints Handling Framework

DISP 1 sets out the substantive complaints handling requirements:

Complaint receipt and acknowledgment

Firms must:

• Provide accessible complaint channels to customers
• Acknowledge complaints promptly
• Identify the relevant matter and engage substantively
• Maintain appropriate records

Complaint investigation

Firms must investigate complaints fairly, with appropriate substantive engagement with the underlying issues. The investigation should:

• Consider the complaint substantively, not just procedurally
• Engage with the customer to understand their position
• Examine relevant records and operational details
• Reach a fair determination on the merits

The eight-week timeline

Firms must respond to complaints within eight weeks of receipt. The response must:

• Set out the firm’s determination on the complaint
• Explain any redress offered
• Inform the complainant of their right to refer the matter to FOS
• Provide the FOS contact details

Where a final response cannot be provided within eight weeks, the firm must provide an interim response explaining why, when a final response is expected, and the customer’s right to refer to FOS at the eight-week point.

Complaint handling principles

DISP 1.4 sets out the substantive principles for complaint handling:

• Complaints must be handled fairly and promptly
• Complainants must be treated with appropriate sensitivity
• Resolution must be substantive, not just procedural
• Senior management must oversee complaint handling appropriately

Complaints data and reporting

Firms must maintain comprehensive complaint records and submit complaints data to the FCA periodically through the SUP regulatory reporting framework. See our SUP Guide.

The Financial Ombudsman Service (FOS)

The FOS is the independent body that resolves disputes between consumers and financial services firms. It operates under DISP 2-4:

FOS jurisdiction

The FOS has jurisdiction over:

• Most regulated activity by FCA-authorised firms
• Complaints from eligible complainants — primarily individuals and small businesses
• Complaints relating to events within specific time periods (typically the most recent six years)
• Complaints that have been through the firm’s internal process or where the eight-week timeline has elapsed

FOS process

When complaints reach FOS, the process involves:

• FOS investigation, including obtaining information from both parties
• Initial determination by an FOS investigator
• Right to escalate to an Ombudsman if either party disagrees with the investigator’s view
• Final Ombudsman determination, which is binding on the firm if the consumer accepts it

FOS award limits

FOS award limits are updated periodically and represent maximum compensation FOS can require. Limits operate at different levels depending on when the matter arose and the type of complainant.

FOS fees

The FOS funds itself through case fees on firms with material complaint volumes, plus a general levy. The fee structure provides operational incentive for firms to resolve complaints internally before they reach FOS.

Root Cause Analysis

One of the most significant aspects of DISP — and an area of increasing FCA supervisory focus — is root cause analysis. DISP requires firms to identify and address the underlying causes of complaint patterns, not just resolve individual complaints.

Effective root cause analysis typically includes:

• Categorisation of complaints by underlying cause type
• Trend analysis identifying recurring or emerging patterns
• Investigation of complaint clusters relating to specific products, processes, or staff
• Action plans to address identified root causes
• Tracking of action effectiveness
• Senior management engagement with root cause findings

The FCA examines whether complaint root cause analysis substantively drives operational improvement — not just that it exists as a procedural discipline.

DISP and Consumer Duty

The 2023 Consumer Duty has elevated the substantive expectations on complaint handling materially. Key intersections include:

Consumer Support outcome

The Consumer Support outcome (PRIN 2A.6) requires firms to provide accessible support including effective complaint handling. See our Four Consumer Duty Outcomes Guide.

Avoiding foreseeable harm

The cross-cutting rule on avoiding foreseeable harm engages where complaint patterns indicate foreseeable customer harm that the firm has not addressed. See our Cross-Cutting Rules Guide.

Vulnerable customer adaptation

Complaints handling must be appropriately adapted for vulnerable customers — see our Vulnerable Customers Guide.

Outcome MI

Complaint data is now examined as part of broader Consumer Duty outcome MI — both volume/trend data and root cause patterns inform Consumer Duty assessment.

Sector-Specific DISP Considerations

Banks and credit institutions

Retail banking complaint volumes are substantial, with key categories including current account issues, fraud-related complaints, savings rate complaints, and arrears handling. The FCA has been particularly active on complaint handling in retail banking.

Insurance firms

Insurance complaint patterns concentrate on claim handling — particularly claim declines, claim delays, and benefit calculation disputes. The Insurance Sector has specific DISP considerations around claim-related complaints.

Investment and wealth management

Investment complaint patterns include performance-related concerns, charges and fees complaints, suitability disputes, and platform service issues. Long-term complaint outcome patterns have substantial industry impact.

Consumer credit

Consumer credit complaints focus heavily on affordability assessment, irresponsible lending, fees and charges, and arrears handling. Historical PPI complaint patterns substantially shaped the broader DISP framework.

Payments firms

Payments complaint patterns include authorised push payment fraud handling, transaction disputes, and customer support quality. The FCA has been active in supervising payments firm complaint handling.

Pensions firms

Pensions complaints often relate to advice given many years previously, with particular complexity around defined benefit transfer advice complaints.

Common DISP Compliance Pitfalls

Under-recording of complaints. Where firms apply too narrow a definition of “complaint” and fail to capture the full scope of DISP-relevant customer dissatisfaction.

Eight-week timeline failures. Where complaint volumes exceed handling capacity and the eight-week deadline is missed without adequate interim communication.

Procedural rather than substantive complaint handling. Where complaint responses meet formal DISP requirements without substantive engagement with the customer’s underlying concern.

Inadequate root cause analysis. Where individual complaints are resolved but underlying patterns are not identified or addressed.

FOS adverse pattern unaddressed. Where firms continue practices that FOS has consistently determined adverse to consumers without adjusting their approach.

Senior management disengagement. Where complaint matters are managed operationally without substantive senior management oversight.

Vulnerable customer adaptation gaps. Where standard complaint processes are applied to vulnerable customers without appropriate adjustment.

Inconsistent complaint outcomes. Where similar complaints from different customers receive different outcomes through inconsistent handling.

Data and reporting weaknesses. Where complaint data is incomplete, inaccurate, or not produced reliably for regulatory reporting.

DISP and Senior Recruitment

Effective DISP compliance requires specific senior team capability:

• SMF16 (Compliance Oversight) — typically owns overall complaint handling framework. See our SMF16 Guide
• Head of Complaints — increasingly common as a dedicated role in larger firms
• Senior complaint handlers — managing complex or high-value complaints
• Root cause analysts — focused on identifying systemic patterns and driving operational improvement
• FOS liaison — managing the firm’s relationship with FOS for cases that escalate
• Vulnerable customer specialists — providing adapted complaint handling for vulnerable customers

For larger firms with material complaint volumes, the complaints team is operationally substantial. Senior compliance leadership engaging with complaint handling effectively is a meaningful interview topic.

Further Reading and Authoritative Sources

For DISP itself, see DISP in the FCA Handbook. For the Financial Ombudsman Service, see FOS.

Related Guides: FCA Handbook and Conduct

Part of FD Capital’s series of practical guides for FCA-regulated firms: SYSC — Senior Management Arrangements | PRIN — The 11 FCA Principles | SUP — The Supervision Manual | PERG — Perimeter Guidance | The Four Consumer Duty Outcomes | Cross-Cutting Rules & Principle 12 | Vulnerable Customers Under Consumer Duty | TCF and Consumer Duty | SMF16 — Compliance Oversight