Unable to uninstall Sql Server 2012 Express (With SP1)
A month later, I need to test with a full version of SQL locally but remembered I had this pain in the a** to deal with. 

TO RESOLVE:


Change SQL compatibility mode to "Windows Vista SP1/SP2". Go to where it was installed. Path belows for x64 version. For 32x it will be in the ~\program Files (86) directory. 
C:\Program Files\Microsoft SQL Server\110\Setup Bootstrap\SQLServer2012 

Launch CMD, run as an Administrator. Navigate to the directory above. 
Type command Setupup.exe /action=uninstall
Follow the prompts. 
Find your life ~ Shaun T :)