I just noticed last night that the Jonathan Strange & Mr. Norrell TV series has started! I'm so excited. First things first: The show confirms, it's pronounced Norrell, not Norrell. The only person who accents the end of the word (and who also trills the R) is Drawlight, which is not a point in favor of that pronunciation.
Second: it's fantastic. So far, it has the feeling of a period romance, which is exactly the sort of feeling I would have hoped I'd get from the show.
Third: It's apparently free online. So go watch it. It's great.