There is a big difference between the CAA and the FAA. Actions brought by the FAA tend to be civil actions which do not lead to criminal convictions. They are dealt with as an administrative actions where penalties tend to be suspensions of privileges.
The CAA act like the HSE and are responsible for bringing their own prosecutions. They still have to operate on the basis of a) is the prosecution in the public interest and b) the likelihood of securing a conviction.
The recent prosecution of the flying instructor who flew through the Red Arrows display at Duxford was a case of yes to both criteria.