By Antony Clements-Thrower The Princess of Wales’ sudden spell in hospital has given rise to a new motto for the family, according to royal sources. Kate, 42, was admitted to The London Clinic on Tuesday for planned abdominal surgery which was successful. The operation is expected to keep the royal off her feet from duties until at least Easter time. The exact procedure the future queen underwent is currently unknown. The Princess will likely between two and three months recuperating, and is not expected to return to public duties until after Easter based on current medical advice. Prince Will…