It seems to me that the guy was caught out with the weather
Elected to try Battersea in conditions that were not suitable for VFR flying
it wasnt a safe option at that time of the day in those conditions
Doing a mix of VFR/IFR in this case was very stupid and caused the death of 2 people, one innocent pedestrian who had a very unfortunate end
The lighting of the crane wont be a factor as in daytime these red lights in mist are not effective, maybe powerful white strobes better
Lets keep the skies above London safe no cowboy activity
well that's that then.. someone call the AAIB.. job done.. cause and circumstance the pilot was stupid!