Two killed unfortunately; one at the scene and one later. Sounds fairly horrific.
You can find the BBC news story
here.
Don't have the experience nor the inclination to speculate; after all, with all respect to the media, 'field near the A5199' could well mean the airfield ('The Soaring Centre' aka Husbands Bosworth).
That airfield has a good reputation.
Thoughts are with the families.
[edit:
Scotsman.com article suggests the crash occurred on farmland, not the airfield.]