NLG, seems it kicked off at around 14,000 ft or so as xx189 tracked south west. 7700 squawk appeared on fr24 as it passed north of Falmouth, still heading sw, and descending through around 11,500ft.
The aircraft appears to have followed a wide left turn with continued descent passing around Culdrose at about 8000ft before tracking east across the Lizard, coasting out, then making a left turn back towards the Helford.
FR24 playback is still available to view.
Time will tell, and thankfully there are two people still around to give their 1st-hand input rather than our 2nd-guessing.