Emotional tribute to murdered son

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Sally and Colin Knox described son Rob as "the social hub of his large circle of friends."

They said they hoped his role in the forthcoming Harry Potter film will sharpen the focus on knife crime in the UK.

Dad Colin said: "Rob was so popular because of his popularity in Harry Potter, bringing a larger media attention to the problems of knife carrying. If that serves the purpose, then hopefully Robert will have done something else exceptional in his short life."

Mr Knox read from a statement saying: "We would like to give thanks for all the support from family and friends and people who didn't know Rob, who have expressed their sympathy and shock.

"It's impossible to convey the sadness and loss that we all feel, but we now realise Rob touched many people's lives. Rob was a happy, outgoing and a fun person to be with, he was the social hub of his large circle of friends."

Rob had gained A-Levels at Beths Grammar School and excelled at sport including martial art, Tae Kwon Do and rugby.

Mr Knox, 55, continued: "With knives there are no winners and only losers. If you are a person who carries a knife, think about the consequences before you carry the knife. But if you carry a knife there's the intention to use it, so please don't do that for the sake of my son."

Rob's younger brother Jamie, 17, who is an Olympic hopeful in Tae Kwon Do, said: "My relationship with Rob was a very strong one. We'd do almost everything together and he just took me everywhere he went. He was just my best friend."

Rob died after becoming involved in a fight outside the Metro Bar, Station Road, Sidcup Police have arrested a 21-year-old man on suspicion of murder. He remains in custody.