Andy Duncan, 54, joined Camelot as managing director in 2011. Nigel Railton, chief executive of Camelot Global, will take over UK operations while the board “considers its options” for Duncan’s permanent successor.

“It has been a great privilege to have led Camelot and the National Lottery through an exciting period. I’m proud that total returns to good causes during the past six years exceeded £10bn, an increase of 25% or nearly £2bn compared with the previous six years. This money is distributed to society in order to change the lives of people across the country,” Duncan said in Campaign.

“I believe that the purpose at the heart of the National Lottery has never been stronger, changing lives by creating a millionaire nearly every day while returning more than £30m to good causes every week.”