It is fortunate though that Her Majesty has much greater testicular fortitude than the current gelded Prince of Whales.
It would be an honor to pledge my sword for her service and doubly honorable to do the same for a king fit to succeed her.
Do you mean literally gelded, or in the sense of waiting in the wings, for the throne? Despite Charles' occasional silly pronouncements I'm quite confident he'd make a good king, and would show his mettle should England once again be in mortal danger.