I get all the fun ones (not very interesting video) - probably an old person - was mostly doing 20MPH the odd time sped up to 30 - with their main beams on most of the time - occasionally turned them off (I think by accident) and slowed down to 10MPH until they turned them on again.
Video doesn't show it very well but every 2nd to 3rd car was flashing them. I'm not sure near the end they didn't drive towards the other driver intentionally rather than because they couldn't see where they were going.
Unfortunately had forgotten the numberplate by the time I got to my destination and it doesn't show in the footage due to being night.
(2/3rds of the video I was using idle revs and all - barely touched the accelerator or brakes)
EDIT: Average speed was 27.18 MPH which surprises me - thought it would be closer to 20. On a normal day it is 41-42MPH over the same stretch.