Cant delete a google calendar which is no longer online, but presumably still in the local iCal cache?

I have subscribed google calendars linked to my iCal app, but have deleted one of my calendars. This calendar is no longer visible on the google online calendar view but is still present in iCal. If I make new calendars they all appear in my iCal app, so I know the account is working correctly.

This residual calendar left in my iCal comes up with subscription errors all the time (assuming because it con not be sycronised because it dosent exist)

Likewise when I try and delete it inside iCal.

Would this be a problem where the calendar remains in my iCal local cache? I am assuming that I would have to remove the google account completely and re install the Account fresh.

Thanks in advance for any help 🙂

Marty