Childermass can't disagree with the company being likable so he won't say anything about it at all, giving his own laugh at the thought of Strange trying to introduce him to Arabella. In theory, he had done just that at the Prince's ball, only that Arabella hadn't been real. Fortunate and unfortunate all at the same time. Probably not a good idea to mention it, though.

"I do not think she will like that much at all, Mr. Strange," he says that instead. "Even if I have left Mr. Norrell's service."

Or she will, if nothing else, find him highly suspect. He can't even blame her if she does, assuming that ever even happens. It's almost something to hope for since it means he's back and uncursed, but... He won't dwell on that. It's pointless to, especially since he actually is nodding off about now himself.