I have a particle system in my composition and can see the Z axis on the top left of the screen as well as the floor perspective wireframe in my preview composition.
However it renders this when I output it.
How can I turn this off so it does not appear in my renders?
It shouldn't appear in the renders at all to begin with. Composition overlays are not supposed to... Otherwise there's a whole "Grids and Guides" Section in Particle World where the individual options can be turned of and tweaked...
What plug-in? Sounds like Particle world. How are you rendreing? There is not enough information about your project to give you much help.