Didn't know that about napit. Just wondered, as round my area it seems to be almost exclusively nic and on this forum elecsa seems to be popular, only ever seen one van locally with a Napit sticker and they were builders. I joined the nic purely for the larger name/logo recognition, as that's what the public like to see. I would have thought that despite any kudos that went with napit registration, when it comes to notifications they're all just the same and the rest is just just advertising. We also do gas work and have maintained membership of corgi for the same reason of name recognition, we get far more work through them as with the gas safe register simply because of the association.
Sorry, know this is an electrical forum!!