Thwok: From what I can read
here the answer is September 14!
So, it looks like a 8.33KHz radio is required for 9 months of 2014. Not that you'll ever be asked to tune a 8.33KHz frequency, it's there "just in case".
I can see the Ops Inspectors at the CAA rubbing their hands with glee! Surely there will be some "get out of jail free" card to avoid the pointless and costly fiasco??