The death of a patient due to clinical negligence has led the NHS to terminate the contract of the private firm who provided the doctor.

Take Care Now hired Daniel Ubani to work in Cambridgeshire for the NHS.

But on his first shift as a UK locum, he killed patient David Gray with a painkiller overdose, reports the Guardian.

Ubani, a German national, was convicted in his home country of causing death by negligence in an incident which occurred in 2008.

He had flown in to take up his new post the day before and Ubani said that he had been "too tired" when he administered the drug, which was ten times more than the normal recommended dose.

The clinical negligence case led to an internal NHS investigation into Take Care Now.

It carried out 20 unannounced inspection visits and has declared that its dissatisfaction and concern with the overall performance of Take Care Now had led to a formal remedial notice being issued to the company.