"but my first visit to Kellynch will be with a surveyor, to tell me how to bring it with best advantage to the hammer"

As this was most likely written before SW accumulated so much debt he needed to retrench, Mr. Elliot could not have meant in his letter that he would simply carelessly allow Sir Walter's (non-existent/few, so far) creditors to *foreclose* on the Kellynch property.

So if it's not foreclosure, how else can Mr. Elliot auction off Kellynch? Is it possible for Mr. Elliot, when he becomes Sir William, to SELL Kellynch? I understand Sir Walter is restricted from alienating the whole of Kellynch (chapter 1). (And I'm vaguely guessing that the restrictions are attached to the title of the Kellynch property itself?) So why won't Sir William be similarly so restricted? Or is it possible that the restrictions apply only to Sir WALTER's lifetime or whatnot?