Why does Mr.Jaggers keep referring to Magwitch in New South Wales and Provis as one who will probably come to London to see Pip?Great Expectations...

Mr. Jaggers has been rather circumspect in Chapter XXXVI
when Pip has inquired about the name of his benefactor, telling Pip that is a question
that will "compromise" him, but when that benefactor comes to Pip, this occurrence will
mark the end of Jaggers's business with Pip. So, when Pip goes to Mr. Jaggers in Chapter
XL of Great Expectations in order to ascertain if, indeed, Magwitch
is his benefactor, Mr. Jaggers replies, "That is the man...--in New South
Wales," implying that Magwitch is in New South Wales, a territory to which convicts from
England were transported. 

Mr Jaggers explains to Pip that
he wrote to Magwitch in New South Wales that he has been expatriated for the rest of his
life and cannot return to England without "the extreme penalty of the law."  The lawyer
reiterates with each of his sentences that his communication with Magwitch has always
been sent to New South Wales.  Then, he tells Pip that he has received communication
from a man known as Provis, a colonist.

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"Probably it is through Provis that you have
received the explanation of Magwitch--in New South
Wales"

By this time, Pip has
understood the innuendos made by Mr. Jaggers.  Since Magwitch's return to England would
constitute a grave felony, it would Mr. Jaggers's legal duty to report the presence of
Magwitch in London.  In order to protect himself, and Magwitch, as well, Jaggers
pretends to only know that Magwitch is in New South Wales, and Provis is a different
person.  Thus, when Pip begins to depart, Mr. Jaggers, ever the careful lawyer,
says,

...In
writing by post to Magwitch--in New South Wales--or in communicating with him through
Provis, have the goodness to mention that the particulars and vouchers of our long
account shall be sent to you, together with the balance; for there is still a balance
remaining.  Good day,
Pip!"

By mentioning New South
Wales every time he speaks, Jaggers has himself protected from any accusations that he
knows of Magwitch's presence in England; at the same time, he conveys his message for
Magwitch/aka/ Provis.