JT2 -- No, it has not been stated explicitly that the engines were running. See
http://www.aaib.gov.uk/cms_resources...-SPAO%20v2.pdf
Also worth noting the very sloppy English in the same report:
"On board were the pilot and two police observers. The pilot had been
informed that there were no technical issues with the
helicopter, which contained 400 kg of fuel"
Who certified the amount 400kg of fuel? How, and when?