"I don't think that Drax in the book has a Liverpudlian accent..."
From memory Drax has stolen the identity of a British soldier from Liverpool who lost his memory (and his face) in an explosion.
So supposedly all he knows about himself is from his Army records. As part of his cover he visits the area to try and see if he "remembers" anything.
He doesn't remember the locals because of course he's never actually met them before and the plastic surgery explains why they don't remember him. No scouse accent? "Explosion damaged my vocal chords. I had to learn to speak all over again."
Quite neat, eh?