Examples
Worked examples
- Is an instance
A multi-site drug trial submitted through IRAS to an NHS REC receives a favourable opinion with two standard conditions attached (confirmation of site-specific PI details and a copy of the clinical trial insurance certificate) -- the study can proceed once those conditions are met and confirmed to the REC, alongside the separate HRA assessment of governance and legal compliance that together make up HRA Approval.
- Is an instance
A qualitative interview study submits a substantial amendment to revise its topic guide and participant information sheet mid-study. The REC reviews the amendment and issues a favourable opinion for the amendment specifically, allowing recruitment to continue under the revised documents without a fresh full ethics application.
Counter-examples
Looks similar, but isn't
- Not an instance
A REC reviews an application and requests revised participant information sheets and clarification on data retention before it can reach a decision -- this is a provisional opinion, not a favourable opinion, and the study cannot proceed to HRA Approval until the requested points are resolved and the REC issues its opinion.
- Not an instance
A REC identifies significant, unresolved ethical issues with a proposed consent process for participants who lack capacity and issues an unfavourable opinion -- the study cannot proceed as submitted; the applicant may appeal or submit a substantially revised proposal, but the original application does not advance.
Editorial commentary
A favourable opinion is the outcome a UK NHS Research Ethics Committee (REC) issues after reviewing a research proposal and concluding it raises no outstanding ethical objections, or only minor points that do not require the application to return to the full committee for further review. It is issued under the UK Research Ethics Committee (REC) Policy Document (formerly the Governance Arrangements for Research Ethics Committees, GAfREC), the framework the Health Research Authority (HRA) shares with the devolved health research bodies in Northern Ireland, Scotland and Wales. A favourable opinion is study- and, for some studies, site-specific: it applies to the protocol as reviewed, and any later change to who is recruited, how consent is taken, or what participants are asked to do generally needs its own REC review as a formal amendment.
The three possible REC decisions
Following its meeting, an NHS REC issues one of three opinions on a full research application:
- Favourable opinion — no outstanding ethical issues, or only minor points that can be confirmed to the REC coordinator in writing without a further committee meeting.
- Provisional opinion — specific ethical issues remain to be addressed, or the committee needs further information before it can decide; the applicant responds and the REC reconsiders, at which point it can still reach a favourable or an unfavourable opinion.
- Unfavourable opinion — significant, unresolved ethical issues; the study cannot proceed as submitted. An applicant can appeal the decision or submit a substantially revised proposal as a new application, but the original submission does not advance.
A provisional opinion is not a rejection and an unfavourable opinion is not automatically final — but only a favourable opinion allows a study to move forward without a further round of ethical review.
Favourable opinion vs. HRA Approval
For research taking place in the NHS in England (and the equivalent HCRW Approval in Wales), a REC favourable opinion is a required component of, but is not itself the same thing as, the overall approval a study needs to start. HRA Approval combines the REC’s independent ethical opinion with a separate assessment, carried out by HRA staff, of governance and legal compliance against the UK study-wide governance criteria — things such as data protection compliance, insurance and indemnity arrangements, and confirmation that the sponsor and participating organisations have the necessary agreements in place. Applicants typically receive correspondence about the REC opinion and the wider HRA/HCRW Approval decision separately, because the two assessments, while run from a single IRAS application, are conducted by different bodies against different criteria. A favourable opinion on its own does not authorise a site to start recruiting; the site also needs confirmation of capacity and capability from the participating NHS organisation once HRA/HCRW Approval has been granted.
Conditions on a favourable opinion
RECs commonly attach standard conditions to a favourable opinion — for example, confirming that a revised document has been produced correctly, or that a site-specific detail has been provided — which the applicant satisfies by writing back to the REC coordinator rather than by resubmitting for another full review. These conditions are distinct from the substantive ethical issues that would instead produce a provisional opinion; a favourable opinion with standard conditions still counts as a favourable opinion for the purposes of HRA/HCRW Approval, once the conditions are confirmed as met.
Not the only ethics committee that issues a favourable opinion
NHS RECs are not the only body that uses this three-tier opinion structure. University and other non-NHS RECs in the UK often use the same or similar terminology. Outside the UK, the equivalent decision structures differ by jurisdiction: in the Republic of Ireland, for example, an HSE Research Ethics Committee reviews research within the Irish public health system under its own national framework, separate from the UK’s HRA/REC Policy Document, and a study spanning both jurisdictions needs a favourable opinion (or its Irish equivalent) from the relevant committee in each country — one does not substitute for the other.
Practical implications for research administrators
- Track the REC opinion and the overall HRA/HCRW Approval decision as two related but separate milestones in a study’s approvals timeline, not a single combined sign-off.
- Read any conditions attached to a favourable opinion carefully and confirm them promptly — unmet conditions can delay HRA/HCRW Approval even though the ethical opinion itself is favourable.
- Treat a favourable opinion as protocol-specific: any substantial amendment generally needs its own REC review and its own favourable opinion before the amended activity can proceed.
- For multi-jurisdiction UK/Ireland studies, do not assume a UK NHS REC favourable opinion carries any status with Ireland’s HSE or National Office for Research Ethics Committees (NREC) review routes, or vice versa.
Frequently asked questions
What does a favourable opinion from an NHS REC mean?
It means the committee found no outstanding ethical objections to the research as submitted, or only minor points that can be resolved without another full committee review. It is the ethics-review input to HRA Approval, not the whole of HRA Approval itself.
How is a favourable opinion different from a provisional opinion?
A provisional opinion means the REC has identified specific ethical issues or needs more information before it can decide, and invites the applicant to respond; a favourable opinion means the committee has already reached a positive decision, with at most minor conditions to confirm.
Does a favourable opinion mean a study can start recruiting immediately?
Not on its own. For NHS research, a favourable opinion is one input into the overall HRA Approval (or HCRW Approval in Wales) decision, and the participating site also needs to confirm capacity and capability before recruitment can begin at that site.
Can a favourable opinion be withdrawn?
A REC can review conduct after a favourable opinion is given — for example, in response to a serious breach report or an annual progress report — and raise concerns that affect a study’s ability to continue, but this operates through ongoing REC oversight and amendment review rather than a simple reversal of the original opinion.
Is the process the same in the Republic of Ireland?
No. Ireland runs its own ethics review structures, including HSE and Hospital Research Ethics Committees and, for regulated clinical trials and device studies, the National Office for Research Ethics Committees (NREC) — a UK NHS REC favourable opinion has no standing there, and Irish ethical approval has no standing for NHS research in the UK.
Machine-readable encodings
Use in your systems
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