No information about the crash of Lancaster HK680, the reason of it, the spot of landing and what became the 6 surviving.
The plane was abandonned during a mission to Leuna (D). Probably it was abandonned by the crew after having been hit.
They should have bailed out and perhaps Fl/Sgt Skelton would been killed when landing with his parachute. We don't have also any information on the fate of the rest of the crew.
Maybe they jumped over the Belgian territory, and so could be declared surviving.
Source: Aircrews Remembered