A former Richmond police commander and senior Scotland Yard officer is being investigated for allegedly breaking rules about honours nominations.

Temporary Chief Superintendent Parm Sandhu has been served a gross misconduct investigation notice. She could potentially face a serious disciplinary charge, which in some cases can lead to dismissal.

Ms Sandhu has been place on restricted duties. The enquiry focuses on whether she encouraged colleagues to support her nomination for the Queen's Police Medal (QPM).

The medal is awarded twice a yer on the Queen's birthday and New Year lists. It is given to serving officers in recognition of distinguished service or out standing courage in the line of duty.

National Police Chief Council guidelines say that "any person can nominate any other person for an honour".

However, people are not expected to nominate themselves and are not meant to contribute to or know about the process.

The internal Met investigation is examining an allegation that Ms Sandhu may have contacted other officers support her nomination.

Two other Met Police officers are also under investigation.

Ms Sandhu joined the police force in 1989, rising through the ranks to becoming borough commander in Richmond. Last month she tweeted that she "will be promoted to Ch Supt" in the Metropolitan Police, adding: "I will be the first woman of colour to hold this rank."