Just read the report in detail and as usual the AAIB have done a thorough job. Disappointingly however, you'd think it would have been proof read prior to publication for glaring errors.
ie "Night VFR limits
A private helicopter flight must remain clear of cloud and in sight of the surface, with a minimum visibility of 5 km."
Incorrect on two counts I believe - there's no such thing as Night 'VFR' and the vis limits are significantly less than the quoted 5km. (800m from memory).
JJ