Thanks for those replies. I basically followed Ken's suggestion. I started with the Kings College London dissertation template and used
writer2latex to create a .tex file. Then I gradually built the the Org-File.
I have ended up with something I can use to write using org-mode with a nice Solarized-Dark theme instead of frying my eyeballs in LibreOffice. The key things are the Table of Contents are in the correct place and I have bibtex working the way I want.
The other thing is in the end I have to convert from the .tex file to a .docx file using pandoc. So I'll have to do some minor edits in LibreOffice anyway because it is not saving certain formating features like double spacing. But that will be a two minute final editing job.
So now I just have to write 500 words a day for the next 30 days and I'll have a first draft! ;)
Regards,
Paul