In its forecast for the third licence, the lottery operator has predicted sales of £79bn over 10 years, with £22bn going to good causes. Up to £2.025bn of the good-cause funding will be redirected to the Olympics during the third licence, leaving an average annual contribution of £1.99bn for good causes. This compares with between £1.2bn and £1.3bn a year during the current licence.
Camelot expects ticket sales to increase because it is launching new games, including a global Mega Lottery.
However, the National Lottery Commission, which licenses and regulates the lottery, has concluded that Camelot's predictions are over-optimistic. An NLC spokeswoman said it was theoretically possible but by no means certain that the predictions will be right.
The lottery has so far contributed £150m to the cost of staging the Olympics.
It must contribute a further £600m from its coffers during the second and third licences and £1.425bn during the third licence, taking the total contribution during the third licence period to a maximum of £2.025bn.