There is no reason to disbelieve this witness, and there was a time when the British Ministry of Defense would have investigated this sighting. No more–so they say. But note the comment about the helicopter. We are told almost nothing of the truth these days.
Story Source:
http://www.hamhigh.co.uk/news/ufo_sighting_of_orange_balls_of_light_over_hampstead_heath_1_1513177