Mr Nathaniel also told the court his firm, NVA, tried to give an impression of being a big company through having an impressive website and offering telephone callers different department extensions.
During the Vietnam War, NVA and Viet Cong forces famously used the Ho Chi Minh Trail in Laos and Cambodia to attack the South, while U.S. forces were usually prohibited from chasing them back across the border.
"I would say that the overwhelming majority of victims of crime will be astonished and thoroughly depressed that one of the most violent criminals in the prison system is allowed to engage with the British public in this way, " a NVA spokesman said.