London: A British court has convicted a man dubbed a "ginger extremist" of plotting a chemical attack and planning to kill Prince Charles to pave the way for ginger-haired Prince Harry to become king.

Mark Colborne, 37, a self-confessed admirer of Norwegian mass-murderer Anders Breivik, said he planned to carry out an attack "for the Aryan people".

Plot subject: Prince Harry speaks during the 2015 Rugby World Cup opening ceremony last week. Credit:Getty Images

On Tuesday, he was convicted of preparing terrorist acts, after a jury had failed to reach a verdict in May.

Prosecutors cited evidence from Colborne's diary in which he said he planned to use a sniper rifle to kill Prince Charles.