I agree, however the vast majority of the public won't have heard of NIC, Elecsa, Napit, BSI...etc but a few will have heard that electricians need 'that Part P qualification thingie'. Maybe that's why he wants to display it? Personally, my work complies with Part P, I have paper to prove that, that's all I need. Like hell will I be caught sticking free advertising for these corporate scamsters on my van, a van that I had to pay money to advertise my own company on!