Thanks Ian, it's as I feared. I am using a modified skin. I never managed to understand how to make the changes I wanted without modifying the original files. I knew doing so would come back to bite me. Any pointers to which of the templates and files I will need to update to fix this?
I got a message from google telling me that there was an issue with review snippets on my site. It says "Missing field : 'itemReviewed' - I am using the Foundation 1.0 skin under cubecart 6.2.9 Should I be using a plugin as well or is my skin too old to support this?