The British citizens will have to deal with the traitors first and then the invaders.
The country was very briefly governed as a Republic, albeit a theocratic dictatorial one. The great migration of Dissenter Protestants to the American colonies followed directly after The Restoration of the Stuart line of kings and return to literal "subjection".
We may be cousins, but our branch of the family is quite different from those now living under quislings who kowtow to Muslim occupation.