Here is the official AAIB report on the accident.
Confirms a stall upon take-off.
More worryingly, an 'experienced' microlight pilot was present on the ground and helped prepare the ill fated a/c. Knowing fine well of the owner of this a/c had no flight training.
Report can be found here;
http://www.aaib.gov.uk/cms_resources...SV%2011-12.pdf