Crikey!! It takes a couple of readings to be able to fathom that one!
My understanding of it is:
There is no way of knowing, with the trouble that's coming our way, just how important it might turn out to be for us in this country, if you were to continue to carry on with this impersonation of Everard Dominey of Dominey Hall.
In effect, please keep pretending to be Everard. There's trouble coming in the land, and your role in the nation's affairs as "Everard Dominey of Dominey Hall" ( as opposed to some nobody, just some ordinary citizen) may turn out to be of vital importance.
PS I haven't read this book, but they've made a movie of it. How good is the book? Would you recommend it as a good read?
Interested in Language