No I don't hold a CAA/JAA personal license, all the work I've done has been in environments where it wasn't needeed and work was done within a company / organisation approval. I regularly sign off work in that environment.
Frankly, I'm convinced by the arguments above. I wasn't necessarily convinced initially and would caution, one Engineer to others, in this or other issues USE THE SAFETY ARGUMENT. If you start with arguments about rights, how hard you've worked to get your license, or job protection, then any Engineering manager (including me) will consider that good evidence against your viewpoint. Argue safety, back it up with clear evidence, as Blacksheep has done, and your argument is unassailable.
G