In A Tale of Two Cities by Charles Dickens, how is Tellson’s bank affected by the Revolution?

In Chapter 24 of Book the Second, Dickens writes with
witty understatement,

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Monseigneur, as a class, had dissociated himself
from the phenomenon of his not being appreciated:  of his being so little wanted in
France, as to incur considerable danger of receiving his dismissal from it, and this
life together.

Fearing for
their lives, the aristocrats of France have fled across the English Channel. 
Since Tellson's Bank has both a Paris branch and the bank in London, some of these
aristocrats, who have come to England, have transferred their funds to the London
bank. But, even the ones who are "without a guinea haunted the spot where his guineas
used to be."

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As was natural, the head-quarters and great
gathering-place of Monseigneur, in London, was Tellson's Bank....Moreover it was the
spot to which such French intelligence as was most to be relied upon, came
quickest....Tellson's was at thtat time, as to French intelligence, a kind of High
Exchange....so numerous that Tellson's sometimes wrote the latest news out in a line or
so and posted it in the Bank windows, for all who ran through Temple Bar to
read.

Because Tellson's Bank
has served these aristocrats in Paris, it extends courtesy to them in London.  In
addition, those who have lost their money know that the wealthy aristocrats have funds
in Tellson's, so they come in hopes of charity. In addition, it is the place of
sanctuary for the aristocrats where they commiserate and learn
information.

Of course, this setting is one which delights
the pretentious Stryver who shoulders his way among the Monseigneurs who discuss the
state of affairs. It is at Tellson's Bank that the letter for Charles Darnay arrives in
hopes that among the aristocrats who gather there, Monsieur d'Evremonde will be there to
receive the desperate missive of Gabelle.