5MB: Don't forget the new S11 will be FL315+, so I suppose that will be a candidate for 8.33 also.
Reference the numbers at Swanwick:
A requirement (depending on who's presenting the figures!) of between 380 and 410 controllers. Presently 40-odd short (c/10%). Next year maybe another 15 less (13%+).
The only long-term solution: Train like mad to get as many people valid as quickly as possible.
The local management approach: Take instructors out of the simulator to control planes and reduce daily delays.
The result: Ever deeper into the mire.
Good, innit?