Looking at the source code for one of your products -
<a href="http://www.priorypolishes.co.uk/metal-clock-cleaning-materials/metal-colouring-tourmaline.html" title="Metal Colouring (Tourmaline)">
<img src="" alt="Metal Colouring (Tourmaline)" />
There isn't any information for the product image.
Not good enough to sort this out for you!
OK, your images for your products should be stored in http://www.priorypolishes.co.uk/images/source
Possibly in sub-folders, depending on how you run your site.
You can check using your hosting control file manager to see that they're still there at this address.
Best I can do