He learned of the temporary no-fly zone from Bristol Air traffic control that morning but he believed he would only infringe the edge of the zone. He claimed to have telephoned the air traffic-control unit at the site two or three times "but they did not answer". Asked if he had radioed the unit, Barroll-Brown said he did not have the unit's frequency.
Is it the fine or the disciplinary action you are concerned about? It seem to be a pretty clear violation, as he knew about the restricted area but deliberately chose to fly into it anyway. Why didn't he take the extra time to find the ATC frequency? It wasn't exactly an emergency flight.
Perhaps it was a political statement on the nature of such TFR's. Unfortunately, the (somewhat tautological) response of those who put up such restrictions is to use such incursions as justification to keep the restrictions in place, "see, someone busted the TFR - we need to make it bigger!".