Well done Matt
If you want to play with this image further you can download a free program called Noiseware which takes out the noise from your image.
Link to Noiseware
http://www.imagenomic.com/download_nwsa.aspx
Click on
Free Download For Windows
When you open your image in Noiseware go to the default bar blue arrow at the top then scroll down the drop down menu to Weaker Noise and then hit go.
Noiseware will automatically take out the noise in the image then save it. Sometimes it's a little harsh and removes some detail and colour which you can restore by taking the image back to PS and add a little colour back, but until you start stacking it's worth using
Give it a try
Barb