I have now researched this and have found that the problem is in PDF::Template:

"Currently, the only PDF rendered PDF::Template supports is PDFLib (available at www.pdflib.com). An upcoming release of PDF::Template will also support PDF::API2. Unless you need Unicode support, PDFLib Lite is sufficient (and free). Please see www.pdflib.com for more details."

I have consequently asked my provider to install Lite and await their response...

Thanks for your help.