Hi Gaz,
Have you tried to delete preferences file for the Anyconnect? It can be found on th following directory:
C:\Users\username\AppData\Local\Cisco\Cisco AnyConnect Secure Mobility Client\preferences.xml
You can trying deleting the XML profile as well:
%ProgramData%\Cisco\Cisco AnyConnect Secure Mobility Client\Profile
Hope it helps
-Randy-