A Metropolitan Police officer who punched a medical worker in the head after mistaking him for a suspect, before then saying he didn't regret it, has been sacked. PC Jonathan Marsh, was called to a medical clinic in Romford, east London, on November 13 2022 by a man who said someone was damaging his surgery sign. But when the bungling cop arrived at the scene, he mistook innocent Rasike Attanayake - the man who made the 999 caller - for the crook. Shocking footage shows the moment audiologist Mr Attanayake was brutally handcuffed as he pleaded his innocence with the officer. PC Marsh then tells the stunned medical worker to 'get on the f***ing floor now' before hurling Mr Attanayake to the ground and punching him in the head. Marsh, from Canvey Island in Essex, was found guilty of common assault and was sentenced at Westminster Magistrates' Court in April last year - but was spared jail. Despite the attack being branded 'disgusting and unwarranted' by a judge, Marsh defiantly stood by his actions, saying 'it was necessary' and 'proportionate'. He was suspended over the incident, pending a police probe. However, following a misconduct hearing, he has since been sacked. Chief Superintendent Stuart Bell said: 'All police officers know they will be held to account for any use of force, and any use of force must be reasonable. 'On this occasion, PC Marsh went beyond the level of force necessary and it is right that he has to face the consequences of his actions. 'I would like to apologise to the victim of the assault. This incident should not have happened and it is a matter of profound regret that an innocent member of the public was injured in this way.' Body-cam footage of the incident, previously released by the Independent Office for Police Conduct (IOPC), shows Mr Attanayake saying 'please can you not do that' before PC Marsh then punches him in the head and restrains him further. Westminster Magistrates' Court previously heard how he was placed in the back of a police van while continuing to protest his innocence. Within just 10 minutes, the officers were informed that Mr Attanayake was not the suspect. Less than an hour later, he called police to make a formal complaint against the officers. The court heard how he compared his treatment to that of George Floyd, the black man whose murder by a white police officer in America sparked worldwide protests. 'I thought I was going to die because I could not breathe, it was the same thing,' he said. Mr Attanayake was later taken to hospital where he was treated for a bruised forehead and grazes to his arms and wrists. Giving evidence, the audiologist told the court: 'I phoned the police and then I went inside doing other things. 'I said my friend is being attacked by a drunk and disorderly white man. 'I was the one making the phone call, so I went to the car. 'There was a female officer and a male officer, so I went to the passenger side. 'I said I was the one making the phone call for the incident and my friend was getting attacked. 'He (PC Marsh) was talking to me but he was not listening to what I had to say, no offence but he was like a raging bull. 'I said he was a few yards away because it was the same road. 'I was directing them over there, there is a man attacking my friend. 'Officer Marsh put handcuffs on me, I cannot remember which hand because he was twisting it in a funny way. 'I can remember the officer saying: "stop resisting me, stop resisting me".' 'I could not feel my wrist, I was in agony, instead of helping, he was having fun, he was twisting it, it was unbelievable.' 'He struck me with his knees and then hit me on the floor. 'It was so sudden, I was just shocked, I did not know what was happening. 'Instead of going towards the police car, he hit me and left my head in a funny way, I was on my back. 'When I was on the floor, he hit my head and he whacked it on the floor. 'I was in shock, I did not know how many times he did that.' Marsh, from Canvey Island in Essex, was found guilty of common assault and was sentenced at Westminster Magistrates' Court. PC Marsh said he did not regret any of his actions, including when he told Mr Attanayake to 'get on the f*****g floor' and to 'do as you're f*****g told.' 'I don't regret doing it,' he added. 'I understand the language isn't nice but that man needs arresting.' He was asked by his barrister, Ben Summers, if his actions were unnecessary. To which Marsh replied: 'I disagree, I believe it was necessary. I say it was proportionate, it was one blow.' District Judge Annabel Pilling described his actions as 'disgusting and unwarranted'. She told the court: 'I accept it was out of character and you lost self control. 'As a police officer, you were in a position of significant responsibility. (These actions) will reduce trust and confidence in police.' Marsh was sentenced to 12 weeks' imprisonment, suspended for 12 months, and ordered to carry out 150 hours of unpaid work. Marsh was also ordered to pay Mr Attanayake £1,500 in compensation and a standard surcharge of £154. The court heard that Marsh had no prior convictions and had received a number of positive character references. Speaking after the trial, father-of-two Mr Attanayake, originally from Sri Lanka, said the incident had left him with both psychological and physical damage. He said: 'I play cricket as a bowler, but I have been unable to play because of issues I now have with my shoulder. It will get better but I have missed two seasons already. 'Psychologically, I now get triggered by alarms and people in uniforms. I have been a law abiding citizen since I have lived in the UK.' Marsh will be placed on the barred list held by the College of Policing. Those appearing on the list cannot be employed by police, local policing bodies, the Independent Office for Police Conduct or His Majesty's Inspectorate of Constabulary and Fire and Rescue Services.