Can anyone recommend someone to check chassis alignment?

[looksfast]

Hi everyone, my Son has only recently started driving and managed to hit a kerb at some speed with his nearside wheel. The only damage our local garage could establish was a bent lower suspension arm which has been replaced and the wheels aligned. During the alignment however, they think that there is more to the extent of damage than was evident at the outset. They have suggested we take the car to a specialist with a jig and get the car checked. The problem is, they don't know anyone, so I thought I would ask if anyone on here could help?

The car is a Corsa (if that is relevant) and we are near Aylesbury/Tring neck of the woods so close to us would be best, but happy to travel for the right person.

Thanks!