Oh boy, I have just opened up an xlsx file in 7zip and had a look at the xml. I think at this stage, any of that is *way*...

Thanks for your responses, and apologies if my 'we worked through that last week' sounded snippy - that wasn't my intention.

Would you have any suggestions on other ways to go...

Yes, our DBA logged on and initialised Excel. We worked through that last week.