Tyndall later described his membership of these openly neo-Nazi groups as a "youthful indiscretion". He expressed the view that while he regretted his involvement in them, he was not ashamed of having done so: "though some of my former beliefs were mistaken, I will never acknowledge that there was anything dishonourable about holding them." As leader of the NF he continued to openly approve of Hitler's social and economic programme and well as his policies of German territorial expansion. In his 1988 autobiography "The Eleventh Hour", he stated that while he thought that "many of [Hitler's] intentions were good ones and many of his achievements admirable", he did not think "that it is right for a British movement belonging to an entirely different phase of history to model itself on the movement of Hitler".