Possible Clues:

• Frozen arctic region
• Permafrost plain
• Cold enough there for the cockney to turn out to be a hard nut
• Have the barrel drain off in and that's flat!
• Arctic plain with frozen subsoil
• Plain fish almost dry inside
• _______wolf
• A cold, unaspirated, hard nut back there
• When frozen, maybe the cockney turns to a hard nut
• Northern permafrost region