Was the tide out at the time? From the pic it looks like he landed on the sand and rolled onto the shingle given that the flaps are down and (apparently) undamaged. I would assume that if he had gone across the shingle the undercarriage and the flaps would look a trifle more tattered
Good driving Mr. Linton to walk away from an incident like this is great. To leave an aircraft that has suffered minimal damage over and above what caused the unscheduled stop is a big bonus