Try placing it in a Version 9.0 Scripts (the name is case sensitive) subfolder.
Thanks for your prompt reply.
Do you mean copy the 'Resources for Visual Basic.tlb' into the Version 9 folder?
If so I already have the file in there: "C:\ProgramData\Adobe\InDesign\Version 9.0\en_US\Scripting Support\9.0\Resources for Visual Basic.tlb" as well as the file in this location: "C:\ProgramData\Adobe\InDesign\Version 10.0\en_US\Scripting Support\10.1\Resources for Visual Basic.tlb"
The only difference between the 2 installs that I can see is that v10 also has a locale for en_GB.