Excellent information, Charles Heidsieck is my ever favourite bubbly, let’s see if I can make it into First whilst it’s on the menu.
Just a small notion, Charles Heidsieck, Piper Heidsieck and (the dreadful) Heidsieck Monopol are three different champagne houses, unrelated. Sometime in ancient history the founders most likely came from the same family, but they are completely different companies.