At 16:55 22 December 2016, Duster wrote:
This accident is being investigated by the AAIB, but has there been any
eyewitness reports on what might have happened? Initial posting had this
as
a possible winch-related incident?

https://aviation-safety.net/wikibase/wiki.php?id=191862

Published to-day:
https://assets.publishing.service.go...f0b652634c6f36
/Schleicher_ASW_24_G-CFNG_02-18.pdf