... and here is what I found.

http://www.jasnanorcal.org/ink9.htm

Seventh paragraph before the end:

"Now we approach, with proper awe, the BAROUCHE-LANDAU. If Mrs Elton is our guide, it was the ultimate vehicle of the period unless you happened to be the monarch or Lord Mayor of London."

(By the way, Mrs Elton here reminds me a little of Mr Collins; it's not just Lady Catherine de Bourgh, it's LADY... CATHERINE... DE BOURGH.)