Graham Hill came over the top of Barnet, apparently misidentified the lights of Borehamwood for Elstree and clipped the trees at Arkley Golf Course - I saw the wreckage the next day
It's been said previously, ATCOs at LTN were expecting him to divert to them, but 'pressonitis' got him
I recall their cars were at Elstree and it was suggested this was one reason why they 'pressonitis'.
Re this accident for info here is wx at Benson around the time of the accident.
SA 15/01/2017 14:50->
METAR EGUB 151450Z AUTO 29007KT 9999 // BKN006/// BKN014///
08/08 Q1021=
SA 15/01/2017 13:50->
METAR EGUB 151350Z AUTO 29007KT 9999 // BKN008/// BKN015///
08/07 Q1021=
Cloud base on METARs are above aerodrome level and Benson is 203 ft AMSL so the cloud base there would be in the order of 800 to 900 ft QNH. From the information I have gleaned so far the accident site would have been about 800 ft amsl.
As has been said we will have to wait for AIB for any conclusions.