Database Syntax Error when attempting upgrade
After a lot of digging, I realised what was happening. For some reason, there was a second civicrm_saved_search table in the database named civicrm_saved_search-b .

That hyphen - is an 'illegal' character unless you escape it. 

To resolve the issue, all I did was change the - to a _ which cleared everything up and enabled me to upgrade my site within minutes.

Hopefully, this will help someone else one day who has a similar issue!