"Experienced pilot"
You may wish to read some of the other comments:
"There was no evidence that the pilot had received any formal training"
This is very different from the pilot had received "no training".
The microlighter present was an "experienced pilot", not an instructor.
The "experienced pilot" gave the dead chap some instruction: ie "use full power to take-off".
One question being asked by PC PLod and others is whether or not this was the only "informal" training the dead chap receved.
And if he had received other training, who did he get it from?
There are many "lines to be read between" here - but the lesson is the same.
Wise people learn from other people's mistakes - so use an instructor. And remember that getting a licence is only the start of your training.