Eseries / Communicators :: Text-to-speech Voice Missing On E5-00?

The pre-installed Text-to-speech language is English (UK), and when I was first testing the phone, there were two Voice options, "Ellen" and "Martin", both listed as "built-in". Today, upon trying this feature again, only "Ellen" was present. I do not believe that I have accidentally deleted "Martin". I have, however, updated the phone software using PC Suite (to 071.003). I have tried installing the downloadable voice file, but receive an "Update error" when I do. I am able successfully to install other language packages and their associated voices. This would suggest that the "Martin" built-in voice is still present. Is there a way to recover it (restoring factory settings does not solve the problem;