This paragraph from the AAIB report is more amusing....
In its report, the AAIB said the unleaded petrol for the helicopter-like craft had been stored in a metal jerry can, which had been "used for a number of years".
The pilot had "concerns" about the colour of the fuel, but after checking the "flammability of a small sample" he "convinced himself it was good".
I might have missed something in my training decades ago but how does one test the 'flammability' of a sample?