NOTAMS & TRA's
My observation is that despite selecting what I think was a valid set of criteria (including a very wide corridor straddling RAF Wyton) that the Red Arrows TRA, which was the original point of the thread, didn't appear in the listing. That suggests either that something's not right in the system or that I'm using it wrongly. I'll accept it's entirely possible that I may be doing something wrong and am keen to address this and will then happily share it with my fellow glider pilots - always keen to learn and share experiences, particularly if it helps to improve safety.
rustle - Thanks for the pointer to the summary, jolly useful.