After the Restoration of Charles II in 1660, what is the most plausible POD for the British monarchy to be overthrown and another republic established in its stead? Relatively popular PODs seem to involve the French Republic successfully invading Ireland and then promoting a revolution in Britain as well as the Cato Street Conspiracy along with 20th Century PODs involving a socialist revolution in Britain. All of them suffer from plausibility problems, however, imo.