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Prince Harry is in Henley to meet the Row to Recovery crew of wounded ex-servicemen who successfully rowed across the Atlantic last year. The adventure was backed by the Endeavour Fund, created by The Royal Foundation of The Duke and Duchess of Cambridge and Prince Harry.
Eyewitness 'John Brown', a former member of the Park Lane Boys gang, who accepted a caution for assaulting his partner in 2010, said defendant Nicky Jacobs used a machete with a 12-inch blade during the attack on Pc Keith Blakelock.
He told the jury that he himself had kicked the officer some 10 times after he went to the ground.
Asked why, he said: "Looking back on it I don't know...It was the excitement of the situation, I just rushed forward and kicked him about ten times."
The witness said he had been paid a £5,000 reward by the police after giving a statement during a renewed police investigation into the killing in 1993.
Asked by Richard Whittam QC, for the prosecution, what the officer was doing during the attack, Mr Brown said: "What I saw, he was trying to curl up into a ball, I suppose to protect himself somehow.
"Did he say anything?" Mr Whittam asked.
"I just heard heard screams of 'help, help, help'."
PC Blakelock curled up in a ball and screamed for help as a mob hacked him to death during the Broadwater Farm riots, an eyewitness has told the Old Bailey.
Using the pseudonym John Brown and with his voice distorted by a modulator to protect his identity, the witness described how he saw the killing on the estate in Tottenham, north London, on October 6 1985.
He explained that he had seen Nicky Jacobs, 45, stabbing PC Blakelock with a machete between two and four times as the frenzied mob took part in a "free for all".
Hertfordshire Council has closed St Johns Road, between Woodford Road and Clarendon Road this morning - and say it could remain shut for up to four days.
The council added: "It is possible that by exposing the hole and then subsequently back-filling, this will cure the problem. A small section will be resurfaced upon completion.
We're rescuing two window cleaners who are stuck in their cradle on 3rd floor level of an office block on Great Tower Street, EC3. More soon
Great Tower St rescue update - our skilled rope rescue crews are assisting the window company in bringing the two men back to ground level.
Great news from Great Tower St, EC3! The two male window cleaners have been brought down to earth. Thankfully both are uninjured.
The rematch sold 20,000 tickets in the first five minutes. Then the website crashed, promoter Eddie Hearn told ITV News' Rags Martel.