Camelot chief executive officer Dianne Thompson is to step down from the group in October.

Thompson has been with National Lottery operator Camelot for 17 years and has been group CEO for 14 years. During her time at Camelot, over £21bn has been raised for National Lottery Good Causes. She has agreed to make herself available to Camelot in a consultative capacity, while pursuing other business and charitable interests.

Thompson’s retirement marks a restructure for Camelot with the group set to split its UK and overseas divisions into two separate entities in an effort to “ensure the best possible platform for continued future growth”.

Andy Duncan, managing director of the UK business since 2011, will become CEO of Camelot UK Lotteries Limited and Nigel Railton, currently group CFO and strategy director, will become CEO of Camelot Global Services Limited. Both will take up their new positions on 31 October 2014 and will report to Lee Sienna, chairman of the Camelot Group of Companies.

One of Duncan’s priorities will be to lead Camelot’s ongoing programme of digital transformation of the National Lottery, including an entirely new online platform which is due to launch “imminently”.