This is the harrowing moment CCTV captured a knife-wielding Nazi storming into a law firm before being tackled to the ground by a brave receptionist. Cavan Medlock, 32, turned up at the Duncan Lewis law firm in Harrow, northwest London carrying a black rucksack containing gaffer tape and handcuffs. Medlock's bag also contained a Nazi and Confederate flags, Kingston Crown Court heard. He was told he needed to make an appointment and looked as though he was going to leave. "He turned around in