London 2012 spokesman Mike Lee today attempted to play down the importance of the investigation. He said: "We are very comfortable with our proposals. Clarification is normal."
The 2012 race is reaching a crucial stage with London bid leader Seb Coe and his team looking to do everything they can to overtake favourites Paris.
More than 10,000 athletes would be covered by the offer to provide flexible economy air fares. Every competing country was also offered £26,000 towards paying for pre-Olympic training camps in the UK.