A grieving son has been ordered to pay thousands of pounds in legal fees after he was sued by the foreign doctor who killed his father.
Daniel Ubani, killed pensioner David Gray with a massive drug overdose on his first shift after flying to the UK from Germany to work as a locum doctor.
The case highlighted gaping holes in Britain’s regulation of foreign doctors, leading to an overhaul of the system in order to protect patients.
Although Ubani was struck off the medical register in the UK, he continues to practise in Germany.
In their campaign for justice, Mr Gray’s two sons, Rory and Stuart, confronted Ubani at a medical conference in 2010 accusing him of being “a charlatan”, “a killer” and an “animal”.
Rory Gray, 49, was sued in a German court by Ubani over the incident.
Now, the court has threatened Mr Gray with at 250,000 euro (£200,000) fine if he repeats the insult.
In its judgement the court in Lindau, Bavaria, has also ordered Mr Gray to write to Ubani promising never to call him an “animal” again and instructed him to pay three quarters of the costs of the case, expected to run into thousands of pounds.
Mr Gray said: “It makes me feel physically sick, it is quite hard to believe.
“We went to that conference because we were determined to make things safer for other people - what we have done has changed the laws to make things safer across Europe.”
He said he and his brother did not know what to do next.
“The General Medical Council have thanked us, the politicians have thanked us but now this. It shows the man has no integrity, no remorse,” he said.
Ubani injected 10 times the safe dose of diamorphine into David Gray while on locum duty as an out-of-hours doctor in 2008, just hours after flying from Germany.
The doctor, who trained in Nigeria, was struck off the medical register in Britain over the case and over errors in the treatment of two other patients during a single shift in Cambridgeshire.
The General Medical Council found Ubani had shown a “persistent lack of insight into the seriousness of his actions.”
However, he still works in Germany, where he largely practises in cosmetic surgery, after its criminal courts gave him a nine-month suspended sentence and fined him £6,000 for professional failures in the case.
The case triggered frustration from British authorities, who had sought to have Ubani extradited to face criminal charges in this country, but failed to secure co-operation from Germany.
The pensioner’s sons believe he should be barred from working and four years ago confronted him at a medical conference, seeking an explanation for their father’s death.
Rory Gray said they sought out the doctor because they were shocked that he was speaking at a conference promoting his cosmetic surgery the day after he had failed to attend the GMC hearing which stopped him from practicing in Britain.
Mr Gray, said he and his brother Stuart, a GP from Worcestershire, raised the matter, saying "You've got no right to speak about medical things. You're grossly incompetent,” and describing Ubani as a “charlatan and a killer” before conference staff had them removed.
During the confrontation, Rory Gray muttered to his brother that Ubani was “an animal” – a remark which he says would not have been heard by others.
Mr Gray, a scientist who works for the for the German weather office, believes Ubani was not even aware of the remark until he was provided a transcript of the incident when the doctor tried to sue him over the other comments.
Public concern about the death of their father triggered changes in out-of-hours services to improve oversight of locum doctors. Last month regulators thanked the Gray brothers for their work campaigning for changes to the law.