Andrew Mitchell was childish before Plebgate, says Downing Street policeman PC Bonds was at the gates of Downing Street on night before 'Plebgate' Said he was embarrassed by the behaviour of Andrew Mitchell then He told London's High Court Mr Mitchell 'raised his voice' in exchange PC Bonds said he found his tone 'overbearing' and 'watched in disbelief' Mr Mitchell is suing News Group Newspapers for libel over a story The story in The Sun claimed he called police officers 'f****** plebs' PC Rowland is suing Mr Mitchell for suggesting he fabricated allegations Mr Mitchell is suing News Group Newspapers (NGN) for libel over a story about his encounter with PC Toby Rowland on September 19 2012 A veteran police marksman has told of his disbelief at Andrew Mitchellâ€™s â€˜childishâ€™ behaviour in Downing Street the night before the Plebgate incident. PC Gareth Bonds was on duty when the MP demanded to be allowed to cycle through the main gate, a court heard. Mr Mitchell allegedly shouted: â€˜Iâ€™m the Government Chief Whip. I want to leave through these gates.â€™ In a written statement to the High Court, PC Bonds said: â€˜During this exchange I stood and watched in disbelief at how childish a grown man in his position was being and found it embarrassing. â€˜I therefore spoke to my colleagues and told them to just open the gates as it was ridiculous to argue over a gate. I found Mr Mitchellâ€™s tone overbearing, but he did not swear at us.â€™ PC Bonds, who has been a policeman for 30 years, said the incident was the only one like it in his nine years with the Diplomatic Protection Group. â€˜Most people are quite polite,â€™ he added. The following evening â€" September 19, 2012 â€" Mr Mitchell again demanded to cycle through the main gate in Downing Street, but was refused. He was alleged to have told officers: â€˜Best you learn your f****** place, you donâ€™t run this f****** Government, youâ€™re f****** plebs.â€™ PC Toby Rowland Â is in turn suing Mr Mitchell over statements he made from December 2012 which he claims accused him of fabricating his allegations Mr Mitchell has always denied the comments but admitted saying, â€˜I thought you guys were supposed to f****** help us.â€™ The 58-year-old Sutton Coldfield MP was forced to resign a month later from his position as Chief Whip. PC Alex Jamieson, another officer on duty the night before the Plebgate row, said the MP became â€˜agitated and refused to listenâ€™ when he was asked to use the pedestrian gate. He told the court such events were rare, but recalled an occasion when Labour minister Peter Mandelson â€˜charged through the main gates about five years ago on footâ€™ because he was late for a meeting. PC Jamieson added: â€˜He was furious at being delayed for five minutes and when I explained that we were clearing two vehicles, he said he wasnâ€™t having it and charged through on foot. The gates were already open to let a vehicle in and he wasnâ€™t a security threat as I knew who he was, so I did not challenge him.â€™ Mr Mitchell is suing News Group Newspapers, publishers of The Sun, over the claim that he called officers â€˜f****** plebsâ€™. PC Toby Rowland is suing the MP for suggesting that he made up the allegations.