The Government Says

AAIB investigation to De Havilland Aircraft of Canada Limited DHC-8, 9H-LWB

AAIB investigation to De Havilland Aircraft of Canada Limited DHC-8, 9H-LWB
Local copy of De_Havilland_Aircraft_of_Canada_Limited_DHC-8_9H-LWB_07-26.pdf
Local copy of Glossary_of_abbreviations.pdf

https://www.gov.uk/aaib-reports/aaib-investigation-to-de-havilland-aircraft-of-canada-limited-dhc-8-9h-lwb

seen at 10:32, 2 July in Transparency and freedom of information releases.