I suspect Yorks.PPL's post above contains the commonsense answer.
His reference to the non-appearance (in the NOTAMs) of the TRA over Leeds last week is absolutely correct, I found the same problem. However, he's also correct in that Leeds Radar/Approach would have told him instantly if he'd checked in with them - in fact they were doing that for a lot of people.
His final comment regarding those who fly non-radio is interesting : I don't want to reopen that can of worms, but if someone who is non-radio busts (say) a pop-up TRA which hasn't been NOTAMed, is he culpable (provided he operates in the open FIR etc) ?
FF