That suggests that ATC can't see the 26 threshold. That can't be right.
NS
When I worked at Bumbleside you certainly could see the threshold of 26 (or 27 as it was) and there were CCTV cameras available for the specific purpose of viewing the 02 threshold.
Wind shear and turbulance on the final approach for 26 always has been a known problem, why it's never been published in the UKAIP is a mystery.
It could well be that the Fire Training ground equipment now partially precludes a direct view of the threshold, but I do find it rather odd that ATC didn't see the accident occur or at least the aircraft after it had come to grief.