We understand that, during a pre-planned photo opportunity over Westminster today, we were visible from Trafalgar Square and that our flight coincided with an important memorial service. The timing of our flight was determined by weather, air traffic control and the prior approval of the the Diplomatic Protection Group and required the consent of the Metropolitan Police. We are clearly very disappointed that the timing of the service and our flight have overlapped but there was no NOTAM (Notice to Airmen) requesting the avoidance and the coincidence of timing could not have been known by the crew flying the sortie. Our sincere apologies to anyone present who has been offended by the overflight. We would also like to take the opportunity to advise that the flight was a private one and was not sanctioned by the official Vote Leave campaign.