And Liz de Jager writes in to point out the 2011 work of author Tony Lee over at http://www.amazon.co.uk/Dodge-Twist-Sequel-Oliver-ebook/dp/B005MYA7WA
written long before this TV series, also called Dodge & Twist, concerning Oliver's "...plan to steal the fabled Koh-I-Noor diamond from the 1851 Great Exhibition."
Hmmm. I wonder how much the use of Dicken's out-of-copyright source material by both parties protects Sony against this kind of stuff.
On the face of it, I'm on the side of the author, Tony Lee.
... and, reach for the lawyers.