Sidestream reads the Ministry of Justice tribunal statistics for April to June 2026, published 10 September 2026, as a reason to catch conflict in-house: 14,000 single claims received, 6,100 disposed of, an open caseload of 70,000, up 51% in a year. The formal mechanism no longer catches harm in time, so the conversation that prevents the dispute has to be rehearsed by managers before it arrives.
The Ministry of Justice's tribunal statistics for April to June 2026, published on 10 September 2026, should focus every HR director's mind. In that quarter the Employment Tribunal received 14,000 single claims and disposed of 6,100. Receipts were up 28% on the same quarter a year earlier, disposals were down 6%, and the open caseload of single claims stood at 70,000, up 51% in a year and the highest level in the series.
The Ministry attaches a caveat of its own, which we repeat because it is the kind of detail a number should carry: the open caseload "may still include approximate 3% overcount for Singles and Lead Multiples".
Take the three per cent off and the direction does not change. The Work Rights Centre's May 2026 report gives the queue a face: a case lodged in January 2025 in London South was listed for 2029. Four years between filing a complaint and being heard. The same report puts the number of employment judges in post 19% below the 2022 level, and notes the government's own analysis that the Employment Rights Act 2025 will add a further 18% to the caseload.
Update, 28 September 2026. When this piece was first published it used the Work Rights Centre's caseload figures, which cover an earlier quarter. The paragraph above now uses the Ministry of Justice's own quarterly statistics.
One more change has taken effect since: under the government's implementation timeline, updated on 14 October 2026, since 1 October 2026 "the time limit for bringing a claim to the Employment Tribunal has increased from 3 to 6 months" (Employment Rights Act 2025, s.152, commenced by S.I. 2026/954); for breach of contract claims in Scotland the change follows on 9 November 2026. A longer window to file does nothing to shorten the queue. From 30 October 2026 the harassment duty rises to all reasonable steps, which we cover separately.
Read the figures back to yourself slowly. The formal mechanism the UK has built to catch workplace harm is, in practical terms, no longer catching things in time to matter to the person who raised them. By the time the case is heard, the claimant has moved on, the witnesses have left, the manager involved has been promoted or made redundant, and the organisation has paid the legal bill twice over.
Why The Backlog Pushes The Problem Upstream
Acas's 2025 conflict research found that 44% of UK working-age adults experienced workplace conflict in the past year, the highest figure ever recorded. Its separate 2021 costing report puts the annual bill to UK employers at £28.5 billion, in absence, presenteeism, turnover and management time. Most of that conflict never gets near a tribunal. It dies in someone's inbox, or in a quiet decision to start looking elsewhere, or in a passing remark to a friend at the pub. The cost lands on the organisation either way.
The people best placed to catch any of it early are line managers. Yet Mental Health UK's Burnout Report 2026 found that 35% of UK workers did not feel comfortable discussing high or extreme stress with a manager. That is not a sign of broken policies.
It is a sign that the first reaction the team member expects to receive is not curious, or steady, or interested, but defensive, dismissive, or punitive. So the conversation does not happen, the problem grows, and at some point it either leaves the organisation as resignation or arrives in HR as a complaint that no longer fits in the four-year queue. Our speak-up culture training rehearses the moment people would normally stay quiet, with an actor playing the manager.
What Most Organisations Are Trying
The default response to rising tribunal risk is more policy. A refreshed bullying and harassment policy. A dignity at work module added to the onboarding LMS. A communication from the CEO reminding everyone of the new whistleblowing protections under the Employment Rights Act 2025. Each of these is reasonable. None of them changes what happens in the corridor. What the Act means for training budgets is in why cutting L&D is the wrong instinct.
The reason is mechanical. Roediger and Karpicke (2006), in Psychological Science, established that being tested on material lifts long-term retention by roughly 50% compared with re-reading the same content. Most manager training on conflict, harassment and speak-up culture is the re-reading kind. A webinar, a deck, a sign-off. By the time the awkward conversation arrives, the manager is running on whatever instinct they had before the training. The policy is in their drawer, but the first reaction belongs to them.
Passive review wins the room. Retrieval wins the week. Students read a short science text. One group then studied it three more times (repeated study). Another did not study it again and instead wrote down everything they could recall, three times, with no feedback (repeated testing). Five minutes later the re-readers remembered more, 83% against 71%. A week later the order had reversed: 61% against 40%.
Source: Roediger, H. L. and Karpicke, J. D. (2006), Psychological Science 17(3), 249-255, Experiment 2. Author copy at Purdue Learning Lab (PDF).
Edmondson's 1999 work in Administrative Science Quarterly on psychological safety identifies that first reaction as the strongest single predictor of whether a team will surface problems early. Curious and steady, and the next person reports the same thing. Defensive or dismissive, and the next person hides it. Tribunal volumes, complaint volumes, regrettable attrition, all run downstream of those first reactions.
What Actually Works
Two things move the number, and neither is a policy refresh.
The first is rehearsal. In the randomised study co-founder Ben Laumann ran at UCL in 2020 (n = 57), the group that rehearsed a feedback conversation with a role-play coach was scored significantly higher by two independent assessors rating blind than the groups taught the same content by video or slideshow. Self-rated confidence did not predict observed performance. That is why we measure recorded behaviour rather than rely on self-report.
The second is repetition. Ericsson's Peak (2016) work on deliberate practice is clear that motor behaviours, including the first-reaction kind, change with focused, feedback-rich repetition. They do not change with awareness. A manager who has practised three or four times what they do when a team member says "I do not want to make a formal complaint, but" has a different first reaction than one who has only read the policy.
What We Do About It
Our manager workshops and immersive simulations are built for exactly the conversations the tribunal can no longer catch in time. Small groups of managers work through realistic scenarios with professional actors, the disclosure that arrives in a one-to-one, the bystander observation of a borderline comment, the team member who has already started drafting a grievance and wants to know if it is worth filing.
The manager runs each conversation live, with feedback, more than once. By the third pass the instinct is starting to feel automatic rather than effortful. That is the only point at which the corridor conversation begins to do the work the tribunal no longer can.
When the formal route takes four years, the corridor conversation has to do the work the tribunal cannot.
The organisations that get through the next legal cycle without a stack of stranded claims will not be the ones with the longest policies. They will be the ones whose line managers have practised the awkward conversation enough that the right instinct is the first one. Read our piece on the April 2026 speak-up rules, or book a call to look at what manager rehearsal would look like in your organisation.
Book a free 30-minute diagnostic call → or read about our research-backed approach.
The UK Tribunal Backlog In Summary
With the Employment Tribunal running years behind, the formal route can no longer catch workplace harm in time to matter to the person who raised it. For the next several years the only release valve that works in real time is the conversation between a team member and their line manager, and most of those conversations run on untrained instinct.
- A case lodged in January 2025 was listed for hearing in 2029. The Ministry of Justice counted 70,000 open single claims at the end of June 2026, up 51% in a year, with receipts up 28% and disposals down 6%. The Work Rights Centre puts the number of employment judges in post in April 2025 at 19% below the 2022 level.
- Acas found 44% of UK working-age adults experienced workplace conflict in the past year, and separately puts the annual cost to employers at £28.5 billion, most of which never reaches a tribunal.
- Mental Health UK found 35% of UK workers did not feel comfortable discussing high or extreme stress with a manager, a first-reaction problem rather than a policy one.
- The 2020 UCL study behind our method found rehearsal with a role-play coach produced significantly better observed behaviour than an instructional video or slideshow.
Sources: Ministry of Justice, Tribunal Statistics Quarterly: April to June 2026 (published 10 September 2026) · Department for Business, Innovation, Science and Trade, Plan to Make Work Pay and Employment Rights Act: timeline update (updated 14 October 2026) · Work Rights Centre, Employment Tribunals in crisis (May 2026) · Acas, How prevalent is individual conflict at work in Great Britain in 2025? · Acas, Estimating the costs of workplace conflict (2021)