TV drama adaptations: High art or low figures?

The guillotine fell last Wednesday night on the final episode of Wolf Hall, the TV adaptation of Hilary Mantel’s Man Booker Prize-winning historical novels.
The BBC decided to condense her two novels — Wolf Hall and Bring up the Bodies — into six hours of drama. It delivered a fine effort although dwindling audience figures — it lost a third of its viewers by episode four — brought the broadcaster some criticism.