UK Tribunal Backlog Hits 531,000 as AI-Drafted Claims Pile Up

The numbers doing the rounds this week are worth sitting with. UK employment tribunals ended the fourth quarter of 2025-26 with 531,000 open claims on the books, up from 491,000 a year earlier, according to Financial Times reporting on the latest Ministry of Justice figures. Active single-claim cases hit 64,000, an increase of 55 per cent year on year. In the same quarter the service received 22,000 new claims and disposed of only 11,000.

The angle that has judges and employment lawyers on edge is what the incoming filings actually look like. Tribunal judges and employment lawyers have raised concerns about 'hallucinated' precedents, which are fabricated references to legislation or case decisions that do not exist, and about AI-generated submissions that cite case law that does not apply or incorrectly state statutory rights, HR Review reports. Ailie Murray of Travers Smith frames it plainly: AI can be inaccurate and end up 'creating claims and arguments that are not valid or are not relevant to the employee's circumstances.' Rob McKellar at Peninsula points to 'a significant increase in the number of multiple claims being made by individuals representing themselves with the use of AI.'

The reason this matters beyond a legal-trade story is that tribunals are the pressure valve for statutory employment rights in the UK, and the disposal rate is the number that decides how fast anyone actually gets a hearing. When incoming volume runs at roughly twice the disposal rate and each new filing is more document-heavy than the last, the wait time is what stretches. Imogen Finnegan of Bellevue Law describes the effect on employers as 'longer timelines, increased costs and prolonged uncertainty,' with delays landing on employees trying to resolve disputes.

The honest caveat is that the reporting doesn't quantify how much of the 531,000 is specifically driven by AI-drafted claims versus broader post-pandemic caseload growth, and it doesn't say how tribunals are policing hallucinated citations at the point of filing rather than at hearing. Those are the interesting operational questions sitting behind the headline number.

The forward-looking read is that the same AI capability inflating filings on the claimant side is a plausible triage tool on the tribunal side, and HR teams that build a defensible playbook for AI-drafted grievances now will spend less of the next year absorbing them the hard way.