Looking at some of the brief video footage, that’s a long set of skid marks over the grass, a heavy impact & car moved a fair way after impact.
They (don’t know if he or she) will have to explain how they were driving with due care & attention for the road conditions, remembering any speed zone is a limit, not a target.
Patch of oil, tyre blow out, man hole cover, clipped a curb or another car (maybe the Mr white van gas man who gave Phil a kiss)... we don’t know... I can only guess they were having a loud pedal tussle & the other driver scarpered - as above, hope they recover well