Things are changing rather quickly on our little island.
(History of Britain, History of England, History of Wales, History of Scotland, Celtic History, Roman History)
So the Gallic Empire has been defeated and now Britannia was back within the folds of Rome. That was probably more than a little disheartening for the Romano-British. Once again, its rulers were on the other side of the world rather than just on the other side of the channel. The Romano-British were probably getting used to having the attention of Emperor Postumus. After all, Britannia was almost certainly the little jewel in his empire considering how stable and prosperous it was. And now he was dead and the empire was gone.... and they were going to get neglected once again.