For other instances of odd prosecution tactics, there was a prosecution some time ago where an internal CAA memo advised against prosecution, but the CAA went ahead regardless.
Only when FL threatened to sub-poena the person who wrote the memo did the CAA yield. If memory serrves right they paid all costs as well.
If I remember rightly, the CAA is the only (or one of the few) prosecuting organisations which when it gets a conviction extracts the costs of mounting the prosecution in the first place . . .