Originally Posted by
clidx
What are my options here? Bearing in mind I don't know much more than punctures, adjusting brakes and general maintenance.
The cable ferrule really needs to be replaced,
Park Tool Co. » ParkTool Blog » Housing Length if you can't do this yourself, find a good LBS, get a quote and it acceptable, get them to fix it.
Would guess the cause of the issue is your cable is too short, which has put too much pressure on the plastic ferrule.