After much looking around, I found the old C.K bit set that I'd mentioned earlier. It was called 6 in 1. I remember now that I changed one of the PZ2 bits over to PH2 because I noticed that it is a Wekador and that reminded me.
There's a new C.K set similar but it doesn't have a brass finish bit holder.
My Wera Impaktor bit set arrived and I've tried a few 5 & 6 sized screws into a plank of wood to try it out. The PZ bits are still perfect. I'm not too fussed on the big bulky Impaktor bit holder though. I can see the slide out magnetic collar being handy for holding a screw on the drill to reach an awkward place but for general, especially repeat, screwing I think it would soon be a nuisance.
I think I have one of those bit holders kicking about somewhere, its got a magnetic collar around the bit and I think I needed to pull the sliding outer to get the bits out.
Problem was when there was dust or something in the holder and it became awkward to get it to release the bit.
Plus visibility of the screwhead wasn't good so I couldn't see when the screw was nicely seated just beneath the surface of the timber.
I like the basic bit holders better.
I have a load of the little plasterboard bits, like this...
Which are variable in quality. When brand new they seat the screws too deep so the buglehead screw breaks through the paper (causing pops in the plaster eventually) but after a bit of use they wear in better and the bugleheads just indent the paper right.
Like the one on the right here.
I tend to start them out on other screws to pre-wear them a bit.
Then on some of them the collar comes off but thats easy enough to epoxy back on.