A Metropolitan Police officer called his ex-girlfriend a "f***ing slag" and threatened to knock out a police colleague at a cocktail bar in Soho, a court has been told.

PC Daryl Marley, 32, insulted Grace Shearman at Simmons Bar on October 29 last year shortly after they broke up.

He is also accused of threatening to punch PC Tom Evans while he was allegedly “tensed up” and in a “fighting stance”.

The officer has admitted saying the words to Ms Shearman but denies common assault and using threatening, abusive, insulting words or behaviour to cause harassment, alarm or distress.

Ms Shearman, who is also a police officer, was attending a Met colleague’s leaving do when Marley approached her, Westminster Magistrates’ Court heard on Monday.

Mr Evans told the court Marley grabbed her arm and whispered into her ear: “I can see you’re being a little f*****g slag”.

The witness said Marley approached Ms Shearman 10 minutes later, before he stepped in to prevent the situation escalating.

He told the court: “(Marley) put his arm on my right shoulder and whispered into my ear: ‘I know you’re following her, you little f*****g creep’”.

Mr Evans said he asked Marley: “What the f**k did you just say to me?”

The defendant allegedly replied: “I’ll f*****g knock you out, you c***”.

Mr Evans said: “I felt like he was going to approach me and punch me. It was the aggression in his voice and the look on his face. He was tensed up.

“He looked as if he was going into a fighting stance.”

He said Marley was held back by people in the bar before security intervened.

Campaspe Lloyd-Jacob, defending, said Marley did not threaten Mr Evans and said: “Go and sleep in your car, you prick”.

She acknowledged the words “f*****g slag” but disputed the exact sentence used by Marley towards Ms Shearman.

Two police officers giving evidence said they did not hear Marley threatening Mr Evans despite being close to them when the threat was allegedly made.

The trial continues.

Reporting by PA.