Well, it depends what country you think has the most pull in the Empire.
Some of the more notable cities in the empire are (I think, my British Geography is pretty poor) Nantes, Rennes, and I think that Poitiers is also in your empire; Cardiff... and my knowledge ends rather abruptly there; Edinburgh, Aberdeen, Dublin...
Some of the more notable cities in the empire are (I think, my British Geography is pretty poor) Nantes, Rennes, and I think that Poitiers is also in your empire; Cardiff... and my knowledge ends rather abruptly there; Edinburgh, Aberdeen, Dublin...