I’m not that knowledgeable about post-apocalyptic fiction, but one novel I know is fantastic, and one which speaks to me as a former inhabitant of the curious county of Kent, is Riddley Walker by Russell Hoban.

I cud feal some thing growing in me it wer like a grean sea surging in me it wer saying, LOSE IT. Saying, LET GO. Saying, THE ONLYES POWER IS NO POWER

It’s pretty good.