  For a free--field flat monodromy defect, a formula for the finite part of the
correlator is obtained as a double power series in $(1-x)$ and $(1-\ol x)$
where $x$ and $\ol x$ are lightcone coordinates. It takes the particular form
of a series in $(1-x)$ with coefficients finite sums of hypergeometric
functions of $1-\ol x$ and is identified with a bulk block expansion. A simple
expression for the coefficient of the $(1-x)^n(1-\ol x)^m$ term is thereby
found as an explicit function of the flux and dimension. Some typical examples
are presented.A transformation allows the bulk block expansion to be written as
an Appell $F_3$ function which has simplifying consequences.
