Bill of exchange?

Question

X draws bill of exchange for $ 10000 in favor of Y on payment of goods.
Y having endorsed the bill as "pay Z only" hands it to Z.now Z wishes
to transfer the bill to W in settelment of a debt he owes to W.
explain whether Z can transfer the bill to W.
This question has to be answer under english law

Answer 1

The Bill cannot be transferred to W because it has a condition that it could only be transferred to Z only.