A Black Country GP has been back to Germany to continue the fight to get his father’s killer struck off the medical register in his homeland.

German-based Dr Daniel Ubani has already been struck off in the UK after Cradley Heath-based Dr Stuart Gray’s father was killed with an overdose of diamorphine. David Gray, aged 70, had been suffering with kidney stones.

Ubani was on his first shift in the country as an out-of-hours locum in 2008 when he fatally administered 10 times the normal dose of the drug to Mr Gray.

Dr Gray, of Blakedown near Kidderminster, said the last two years had been stressful, exhausting and costly, but vowed to fight on.

A UK coroner recorded a verdict of unlawful killing at the inquest on Mr Gray, a grandfather-of-four, from Manea, Cambridgeshire. The coroner also accused Ubani of gross negligence.

Ubani was given a suspended sentence in Germany for death by negligence but is still able to work there.

In August Dr Gray was told the German medical authorities were to hold a fitness to practise hearing.

But this is now in question and Dr Gray, aged 50, a GP at Church View Surgery in Cradley Heath, and his brother Rory, 45, a European Space Agency scientist in Germany, have met with the German authorities to push for an inquiry.

Dr Gray said: “The Doctors’ Chambers there – the equivalent of the UK’s General Medical Council – was set to hold a hearing, then Ubani took out an injunction against them.

“They are not allowed to take him off the register. The local government is responsible.

“The Doctors’ Chambers is putting pressure on them to act, but when Rory and I went to see them, they said they weren’t going to do anything more. It was only after talking to a representative and giving him lots more information he said he would look into it again.”

The brothers have been told that there will be a meeting to discuss the issue this month.

By Sally Walmsley