... when looking for a governess for Georgiana!
We learn in ch 35 (THE letter) that he and Colonel Fitswilliam "were most unhappily deceived" in Mrs Younge's character.
OTOH Lady Catherine never errs when placing out a young person, since when she recommend even a young person only accidentally mentioned to her to a family, that family "was delighted with her"
How lucky it is for those careless young men that they managed to conceal Georgiana's scrape from lady Catherine! :-)