In A Tale of Two Cities, who are the hostile witnesses at Charles Darnay's trial in England in Book II?

It is in Chapter 3 of Book II, entitled "A
Disappointment," that we are introduced to Darnay's trial for treason against the
English crown and we also meet the two hostile witnesses that testify against him. The
first of these hostile witnesses is John Barsad, who later on in the novel turns out to
be Miss Pross's long lost brother, Solomon Pross. Note how Dickens introduces an element
of doubt into Barsad's account:

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The story of his pure soul was exactly what Mr.
Attorney General had described it to be - perhaps, if it had a fault, a little too
exactly.

Note the irony in
the description of him as a "pure soul" which is shown by the immediate suspicion that
he is making up his accusations because he has repeated them "too
exactly."

This is a technique that is used to present the
other hostile witness, Robert Cly, "the virtuous servant." Also note the element of
humour that is inserted as Cly tries to prove the "virtuous" nature of his
character:

He
had never been suspected of stealing a silver tea-pot; he had been maligned respecting a
mustard-pot, but it turned out to be only a plated
one.

The ridiculous lengths
that he goes to to try and establish his good character clearly hints at deception
somewhere along the path in his evidence.

So, the two
characters who are hostile to Darnay and testify against him at his trial in England are
Robert Cly and John Barsad. It is important to remember that Darnay suffers two trials
in this novel, and an interesting exercise for you to do would be to compare and
contrast them, identifying similarities and differences.