If there is Restricted Airspace (such as a Red Arrows TRA), then you have no excuse for entering and cannot legally do so, except under any conditions related to the specific TRA. Was there a TRA at Old Warden during the 'alleged' infringements ??
There is always a notified display area in the Daily Nav Warnings, 3nm radius and 3500ft amsl, but this is not Restricted Airspace.
The ATZ (2nm/2000ft aal) is new this year, whenever there is an event on and therefore ATS manned, in an attempt to make people more aware there is something going on there. I agree it would be preferably if this was indicated on the chart, not sure if it is going to be. And presumably, for the benefit of some, on the GPS
