By late 1940 Naujocks had been removed from his position after he fell out of favour with Heydrich.[n 6] The counterfeiting unit continued under Langer before he left in early 1942 at which point it closed down; he later stated that over 18 months, the unit had produced around £3 million in forged notes;[33] the historian Anthony Pirie puts the figure at £500,000.[34] Most of the currency produced in Operation Andreas was never used.[35]