“If your colleague is showing high-warning signs of suicide, guide them to speak to their nearest crisis resolution team (CRT) or GP urgently,” Humber advises. “CRTs are run by specially trained psychiatrists and psychiatric nurses – find their details via your local accident and emergency department.

“If your colleague is already formally diagnosed with a mental health condition and they’re showing high-risk behaviours, help them to contact their care team or centre where they’re being treated.

“Crucially, if you think there’s any chance that your colleague may die by suicide before they’re able to get the appropriate professional help, call 999 to ask for an ambulance.”

You might not feel comfortable getting more involved. In these cases, talk to your colleague’s manager, your workplace’s HR team or the employee assistance programme to make them aware of your concerns.

Don’t underestimate the power of talking and listening. “Make sure that you’re in regular contact with a colleague displaying any suicidal signs – just talking to them about how they’re feeling may help,” Humber recommends. “Plus, if they’re avoiding contact with their close friends, reaching out to them, asking how they truly feel and listening to their responses can help to make a big difference now and in the longer term. Remember that opening up like this can take time, but this regular contact is a clear sign to show them that you value them.”

How to spot signs of suicide in colleagues (and what to do if you’re worried)