Playing about with Denoiser II from Red Giant Software.
Trying out Denoiser II for the first time gives some impressive results. Evan just applying the plug-in to the pic below without making any adjustments got rid of most of the noise.
After applying Denoiser II I gave the pic a curves adjustment and added a little bit of Mojo also from Red Giant Software. Not a bad result but probably could do with some more tweaking.