This is the map which appears in the front of Scrivener's Moon, showing the UK and bits of western Europe as they appear in the era of the Fever Crumb books. It should serve for the Mortal Engines books too, although the ice sheets expands and contracts a bit over the centuries, and by the time of Mortal Engines all the cities marked here will have rolled away or been eaten. I pushed my amateur photoshop skills to the limit this afternoon piling on various souvenirs of Fever's Scrivener's Moon journey, including an ominous BLOODSTAIN... but whose blood is it? (Quite a lot of the stuff is spilled or sprayed about in Scrivener's Moon, so there are several possible candidates!)
Click on the map for a full-size version.