Dismissed after final written warning: pattern of misconduct justified
A development engineer with 4 years' service was fairly dismissed after a final written warning and further complaints about his behaviour. The tribunal upheld the employer's decision.
1 min read · Last updated 18 May 2026
Case details
- #final-written-warning
- #misconduct
- #mentor-behaviour
- #range-of-reasonable-responses
- #prior-warnings
Key facts
- Mr Andersen was employed as a Development Engineer from 2 October 2017 until dismissal on 26 November 2021.
- He received a first written warning in January 2021 for behavioural issues and a final written warning in March 2021 for drinking beer on a Zoom call and other misconduct.
- In September 2021, complaints were made about his behaviour towards an intern and a colleague.
- Following a disciplinary hearing, Mr Andersen was dismissed for conduct, relying on the final written warning.
- The tribunal found the dismissal was fair and within the range of reasonable responses.
Timeline
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Employment began
Mr Andersen started work as a Development Engineer at Rheon Labs Limited.
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Performance review
Mr Andersen had a performance management review noting gaps in soft skills.
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New line manager
Tim Brown became Mr Andersen's line manager.
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First written warning
Mr Andersen received a first written warning for behavioural issues.
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Zoom incident
Mr Andersen was seen drinking beer on a company Zoom call and responded inappropriately.
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Final written warning
Mr Andersen received a final written warning for the Zoom incident and other issues.
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Complaints received
Tim Brown received feedback about Mr Andersen's behaviour towards an intern and a colleague.
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Disciplinary hearing
A disciplinary hearing was held regarding the complaints.
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Dismissal decision
Mr Andersen was dismissed with notice, effective 26 November 2021.
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Final hearing
The employment tribunal heard the unfair dismissal claim.
The legal issue
The tribunal had to decide whether the dismissal for conduct was fair, considering whether the employer had a genuine belief in misconduct, reasonable grounds, a reasonable investigation, and whether dismissal was a reasonable response.
The outcome
The employment tribunal dismissed the claim for unfair dismissal.
The tribunal found that Rheon Labs had a genuine belief that the development engineer was guilty of misconduct, based on complaints from colleagues and the intern. The investigation was reasonable, and the decision to dismiss was within the range of reasonable responses, especially given the final written warning already in place.
No compensation was awarded as the claim failed.
Lessons & takeaways
- A final written warning for misconduct can make a subsequent dismissal for further similar behaviour more likely to be fair.
- Employers should ensure they carry out a reasonable investigation before dismissing, including giving the employee a chance to respond.
- Employees should take warnings seriously and address the behavioural issues identified.
- The range of reasonable responses test gives employers some leeway, especially where there is a pattern of misconduct.
This case shows how a pattern of misconduct, combined with a final written warning, can make a dismissal fair even when the employee has four years' service. The development engineer had received a first written warning for behavioural issues, then a final written warning for drinking beer on a Zoom call and other misconduct. When further complaints arose about his behaviour towards an intern and a colleague, the employer decided to dismiss.
What the employer did right
Rheon Labs carried out a disciplinary hearing, considered the employee's responses, and relied on the existing final written warning. The tribunal found that the employer genuinely believed the misconduct had occurred, had reasonable grounds for that belief, and had conducted a reasonable investigation. The decision to dismiss was within the range of reasonable responses open to a reasonable employer.
What the employee could have done differently
The employee had been given clear warnings and opportunities to improve his soft skills. He had even acknowledged the need for development. However, the complaints about his behaviour continued. Taking the warnings more seriously and actively working on the identified issues might have avoided the final outcome.
Why this matters
This case reinforces that employers can rely on a final written warning when deciding to dismiss for further misconduct. It also highlights that the tribunal will not substitute its own judgment for that of the employer, as long as the employer's decision falls within the band of reasonable responses. For employees, it underscores the importance of heeding warnings and addressing performance or conduct issues promptly.
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