Late last night, BBC News announced the findings of the AAIB accident investigation.
Turns out that the pilot had no official flight training at all, and that this flight was an ill fated solo attempt. On top of that, the aircraft was not insured and de-registered.
From what is described in the report, it would appear he stalled upon take-off.
Here is the BBC News article:
BBC News - Clackmannanshire fatal microlight crash pilot untrained