When we think of Charles Dickens, we think of London – not the imagined medieval London of William Morris, ‘small, and white, and clean’, but the contemporary London Morris described as among the ‘six counties overhung with smoke’. For Christopher Koch, in Crossing the Gap (1987), the London of his imagination was full of ‘rooms where great fires blazed in open fireplaces’. He saw it this way because ‘Mr Pickwick had warmed his coat-tails before such fires’. We know, of course, that there are plenty of other English localities in Dickens’s novels, such as the memorable marshes in Great Expectations (1860–61). We even remember that parts of his novels are set in other countries altogether, such as the American scenes of Martin Chuzzlewit (1843–44) and the Marseilles setting at the beginning of Little Dorrit (1855–57). Yet if we think of the quintessential Dickens setting, it is to London that we turn.