Thanks Moonshine.....I have used Zamzar before and will try it again.

I've got hold of Office 2019 now and was able to open a pdf file with it and convert/import it into Word.

It worked, but as you say, it was a complex pdf, so the Word interpretation of it was of mixed quality. Do you think I might get more joy if I looked into converting the pdf into other formats (HTML, RTF, text etc)?