Maybe book readers could answer this. Why is the gentleman with the thistledown hair able to just start appearing in the human world after Norrell summons him back? Basically before Norrell talked to him the second time, was he unable to travel between the worlds? And was he completely unable to come to the human world before Norell called him the first time?

I'm just wondering, if GWtTH was able to travel to human realm whenever he liked wouldn't he have been getting up to more mischief bc so far he's been pretty tame. Well other than kidnapping a couple of people.