G-CEHG was landing on a private airstrip near Hardwicke, Hay-on-Wye, following a flight from Swansea Airport. The pilot reported that the weather at Swansea Airport was: wind from 100° at 6 kt, 10 km visibility and broken cloud at 3,500 ft amsl. The airstrip was orientated on a heading of approximately 250°M and sloped upwards by approximately 4% over the first 225 m and 10% over the remaining 250 m. The pilot reported that, during the landing, the nose landing gear dug into the ground, the aircraft tipped forward onto its propeller and then continued to topple over onto its back. The pilot was unhurt and exited the aircraft through the left door.
The pilot believed the accident was caused by misjudging the touchdown on the sloping terrain.