It's insignificant, I appreciate, but I went out for a bike ride at 6 this morning and despite signs saying otherwise, the A24 is open again now. (My rides up to the downs take me right past where it happened).
I thought that from the first reports of the arrest I read, but subsequent write-ups make it sound more like he was found in the woods adjoining the golf course (close to expensive houses) so he may not have resided in that area.
I watched the video after you posted the link and it was obviously highly unlikely to be related to the incident due to the A24 at Findon being closed by the police by the time the video was shot - it was clearly some time after the incident.
Knowing that bit of road, I suspect it was someone...
I heard that but assumed it was big tractor grass cutters out on The Gallops. Turns out it was a helicopter searching for someone who had gone missing from Swandean.