Agree about the right brakes gripping but the vehicle had a strange reaction while braking. The front left dipped and the front right lifted giving the vehicle a heavy pull to the right. It seems as though the rear brakes did engage or not fully.
The car is heading back soon.
Just in case anyone else has this vehicle the issue for me happens when driving in heavy rain for a period of time without applying brakes and the automatic windshield wipers are engaged.
We only need a second to make a mistake.