Hi Raymond,
Thanks for replying.
As per my app information, I currently have Office 365 installed. This has only been the case in the last seven days. Before this I had a standalone version of Office Home and Student 2016.

I have followed the initial repair instructions you suggested but unfortunately this has not resulted in a resolution.
If I were to follow the follow-up instructions and use the Support and Recovery tool the implication is that it would only remove Office 2016 from my device, which is the opposite of what I want to do:

I can see in my online account that I still have 2016 listed as an available product, but if I click on 'DOWNLOAD NOW' it simply wants to install 365 again. Because of this I have been reluctant to remove what I have and re-download.

If you believe this would be the correct route to me getting 2016 back however, then I will do so.
Thanks.