I had a sudden thought! In the back of a cupboard was an old TwinHead laptop I had bought in Hong Kong in 1998. I last used it in 2005 but in the case was a pirated copy (HK) of Office 2003. I could not find the product code so I fired it up and when it was up and running again on W98 I tried to establish whether the product code was hidden in the Office software but with no success.
The presentation was totally different to W7 and 10 so I could not find out anything about it.
The last effort so I am going to have to buy it.