No TIBA, no TRA, no NOTAMS. We call this the Short break procedure. We use this process in times where a controller must take a break and there is no one qualified to work the airspace. Simply refusing access to airspace for 30 minutes appears to be another new way of handling it.
Easy enough to keep IFR out of CTA but what about VFR in E looking for a service. IFR pickup, anyone?
I heard that the expression "due staff shortages" or similar were NOT supposed to be used but when we get asked "why are we being delayed?", then "operational requirement" doesn't seem to cut it. "Not telling!" doesn't seem to go down well either.