  This article provides two complementary detailed derivations of
Cachazo-Svrcek-Witten-style Feynman rules for Yang-Mills gauge theory coupled
to a massive coloured scalar as presented in earlier work. These proceed
through a direct canonical transformation method on space-time and through a
gauge transformation in an action constructed on twistor space. It is shown
explicitly that the field transformations are identical in both cases. Some
simple tree-level examples of our rules are given and we comment on the
application of them to the calculation of the rational part of one-loop pure
glue amplitudes. A possible direct quantum completion of pure glue CSW rules
based on dimensional regularisation motivated by these results is sketched.
Finally, it is shown how to derive CSW rules for effective Higgs-gluon and
Higgs-matter couplings proposed in the literature directly from the action.
This derivation yields additional towers of vertices which generate a subset of
the contributions to effective multi-Higgs scattering amplitudes.
