If you think you know who it is then I suggest speaking to him to see if it might have been him and if he agrees with your wifes assessment.
Most aerobatic pilots are aware of the
An aircraft shall not carry out any aerobatic manoeuvre—
(a) over the congested area of any city, town or settlement
But most people on the ground are not good at judging whether aircraft are overhead or just nearly overhead.
The CAA can hardly be expected to do anything on the basis of the information you have given.
ZA