Serge Gustave Sender Wayntraub is the name of the pastry chef extraordinaire who made Charles and Diana's cake. He also made Baudouin & Fabiola's as well as cakes for royalty in Great Britain, Sweden, Japan, Belgium, Denmark, Netherlands, Iran, etc. He was commonly referred to as the cake/pastry chef of Kings.
I have looked now for 30 minutes and can not spend any additional time on it, but Baudouin had a VERY specific list of requirements for his wedding cake that made it quite complicated. It could not be over a certain height, etc.
The chef passed away in 2009 and was Belgian, born in the same year as Baudouin. He had a FANTASTIC collection of cooking items from history - many rare books and utensils. Museum quality collection. He is known for his philosophy of being a life-long apprentice.