Chris is BPV the place which will certificate a home install?
if its up to scratch, yes. Although there is no certificate as such these days. You get a receipt, and the car reg is entered onto a database. Your insurer then looks up your reg on said database as proof of "certification" if you see what I mean.
Should add, last time I was there they charge £50 an hour, and the examination took two hours. This unclouded under car checks of fuel lines and routing, make sure it outboard of the rear subframe, and at least 12 inches from a heat source, or fit heat shield which hasn't been needed yet afaik. Plus they plug in tech 2 to check fuel trims, examine and note tank age size and make, that injectors and vap are solidly mounted.
They will not allow short cuts, and I don't blame them, and that's why I use them.
But as with any tester, you'll need to teach an understanding with them. Firstly that you are prepared to heed their advice, make changes, and re present when rectified if needed. They will also take the piss a bit if they feel your doing the same and trying to pull the wool over their eyes.
They also want to see that you understand the install to an extent, so it's best not to mess about.