Crossing the FIR boundary, as he will have to, and potentially entering the Worthing CTA (if it's still there - my UK chart is zillions of years old but shows the base as FL65 - and flying a turbine powered aircraft (heavier than air)....should this guy not have a type rating for this?
What nationality registration is the aircraft and which (other) country is allowing it to fly in their airspace without, presumably, a certificate of airworthiness or rating to fly it?
Does it have radio and transponder?
What aircraft are they going to follow it with to provide television coverage and how will that aircraft comply with airspace rules?