Source: Flyer https://www.flyer.co.uk/aaib-report-slams-caa-and-airspeeder-after-demo-drone-crash/

Extrait

The Airspeeder pilot lost control and an emergency kill switch was operated but had no effect. The drone then climbed to approximately 8,000ft, entered controlled airspace at a holding point for flights arriving at Gatwick Airport, before its battery depleted and it fell to the ground. It crashed in a field of crops approximately 40m from occupied houses and 700m outside of its designated operating area. There were no injuries.