Most likely, Charles delays his wedding to Lady Spencer. What we, the public, think is temporary (and stated as so) is indefinitely. Lady Spencer due to her doubts (as confirmed in this timeline) and her family's reputation, doesn't push the issue. She marries well. She has four sons and one adopted daughter from a third world country. She suffers from bipolar and an eating disorder. That she only find out about after her suicide attempt (in this time she harms herself A LOT, I'm going to assume she does in that timeline but due to being in a more loving marriage and not famous something is done). Charles is dating proper ladies public after a year or so of his mother being dead. Camilla is his love, but she and he agree she will not divorce. Also, she doesn't want her current children to usurped by their royal half siblings. Charles closely monitors who Andrew marries, but doesn't care who he carries on with in private. Camilla is a presence at private royal functions, but as a “friend”. She is treated well. Andrew marries a lesser princess of a foreign country. Maybe Japan? As in this time line, he produces only female children. Charles grooms them from a young age, as Camilla is getting too old have bio children, to be heirs to the throne. Andrew dies after getting a bad spot with people who unsavory and want access to his family. His death is very similar to Diana's in this time line. Charles dies in 2010 after all the smoking and drinking he's done due to Camilla's influence. Either lung or esphoical. The throne is again inherited by a long living female was never “supposed” to reign much like her grandmother.