Goof

It is quite obvious that the entire production was filmed in the UK. That said, the "travalogue" shots of Geneva are blended in surprisingly neatly. There is however one glorious goof. At the start of the film the diplomatic party sets off from Heathrow. Quite reasonably, the newly-built Queen's Building is in the background. How odd though that, when they fly back at the end, the Building itself is now in Geneva.