I am glad that you enjoyed your meal at the Duck, especially as I will never be able to afford to go there !
£750 for a bottle of White seems amazing !
But it is not really fair to the place or its staff to quibble about the cost. As you said, its a once-in-lifetime occasion, and if you could afford to pay that kind of money without breaking sweat, then its a comfort to know that you are probably in one of the best restaurants in the world !
Thanks for the post Jo !