Yes, that is very fair comment - Although the Dankworth bands always had a very strong jazz contingent in the lineup and there was always some jazz content, the 'showbusiness' element was always very prominent. Dankworth's albums also featured some of his catchy TV themes and - case in point - the 'Theme From Tomorrow's World' , very familiar to just about everyone over here of a certain age .
To my ears 'What The Dickens' also has very much a 50s-West End, sort of 'Victorian music hall' feel sort of in keeping with the Dickens theme. Brits can probably appreciate it but I guess it doesn't travel well .