P Clips

[The Ssssnake]

Hi all

Has anybody got a rough idea of how many p clips are required for running brake/fuel lines (Is there a max. distance between clips) I have noticed you can get double stacked clips as well which look like a push to fit to chassis from car builder solutions. Are these IVA approved or would I be better off sticking with the rubber lined p clips and rivets?

Cheers Jake