Update 2021: The Land Rover Defender PHEV is a variant of the Defender. Some additional tests and checks have been done to ensure that the rating of the Defender, tested in 2020, applies to the PHEV variant.

Euro NCAP performs a series of crash and safety tests on car models:
a frontal impact test, 50% of the width of the car is striking an oncoming deformable barrier, also travelling at 50 km/h
a frontal impact test, the car impacts a rigid full width barrier
a side impact test, a mobile deformable barrier impacts the driver's door
a pole test, the tested car is propelled sideways into a rigid pole.
A series of pedestrian tests are conducted with different impactors, adult and child head form, lower and upper leg form and whiplash tests are performed on a sled as well as AEB pedestrian and cyclist tests.
Active safety is tested based on the car’s equipment: autonomous emergency braking car-to-car scenarios, occupant status monitoring (including seatbelt reminders), lane support and speed assistance technologies.

All details on the Euro NCAP Website:
Land Rover Defender PHEV 2020 test information https://www.euroncap.com/en/results/l...
Euro NCAP December 2021 Press release https://www.euroncap.com/en/press-med...