Philip - Well Scrooge was a miser and would have underpaid his staff. The Clerks wages I quoted was from 1889 so inflation would have added a little to the level of pay. A Christmas Carol is one of my favourite books and I'd advise anyone who likes to read to give it a go this Holiday.
Been looking at some other sites that list some of the costs of living in Victorian era. To rent rooms in 1879, nicely furnished rooms in the better parts of London (again think Sherlock Holmes) would cost as much as 5 to 25 Shillings a week. Bob Cratchit wages would only have covered a small rented house in the poorest part of London, with not much left over for food, cloths etc.
EDIT - One more quick note: For much of that period, £1 would have bought you $11! If only that was the same now, I would be doing all my shopping in the USA :clap: