Mr Dizaei accepted some criticisms of his behaviour

Superintendent Ali Dizaei returned to work at the Metropolitan Police in October after a two year suspension.

Claims he was involved in drugs, prostitution and theft led to the investigation into his behaviour.

One of Britain's most senior ethnic minority policemen, he will face nine alleged breaches of the police code of conduct at the tribunal.

After his acquittal at the Old Bailey, Mr Dizaei reached a negotiated settlement with the force through arbitration.

Promotion

However an internal investigation by officers from another police force, supervised by the Police Complaints Authority (PCA), continued.

A spokesman for Mr Dizaei's solicitors, Avanti law, said: "He is obviously very disappointed that the PCA seeks to continue a process that he had previously understood had been fully resolved. "

Earlier, PCA chairman Sir Alistair Graham said: "Every police officer should face a consistency of treatment as far as the disciplinary process is concerned - we can't have one officer getting special treatment because he is a senior black officer and because there are concerns about race in the police service."

Mr Dizaei, 41, from Henley-on-Thames in Oxfordshire, has been working with the National Black Police Association (NBPA) since he returned to work.

In January he was sent on a promotion course designed to reintegrate him into the force.

Complaint

Mr Dizaei accepted some criticisms about his behaviour as part of an agreement with the force.

He is understood to have dropped a threat to take the Met to an employment tribunal and to have received a payment for distress suffered.

The NBPA condemned the PCA's decision to recommend the Met Police take Mr Dizaei to tribunal and said it would be complaining to the Commission for Racial Equality.

It said the move may incite "racial disharmony" within the force.