This gate pier, the right-hand gate attached to it, and a part of the wall itself, were demolished down to the foundations when a car missed the bend and hit the pier head-on. Luckily only a few stones suffered actual damage including the coping, if this had been concrete there would have been shearing effects all over it.
The right-hand gate was bent, this was straightened by www.kingtonforge.co.uk/ and while restoring the pier and its capital (coping) I worked with them refixing the hinges to provide a 10mm tolerance where the gates latch, including room for future adjustment as the wall settles over time. Broken stones were reused within the pier where damage is not visible, and parts of the work involved stainless steel pin repairs.
I understand that the driver walked away from the wreckage.