Thanks for the guidance - finally decided to crack on with it last week with a fresh install:
Used GParted to remove all existing partitions on the black2
Created 1 partition of 111GB approx
Installed using my Win10 Pro DVD media (luckily as I’d done an in place upgrade previously I just ignored all the requests for a key and once online it recognised my laptop and assigned the key again!)
Installed some progs and then used GParted again to create a couple more partitions
My laptop’s battery was charging during the install and crapped itself part way through, when it’s only 3 months old! Had to start again with the battery removed, so laptop only working on the mains at the moment…
A few oddities with dual graphics and a complete lack of driver support from HP for a 5/6 year old laptop but it’s getting better with a few tweaks
Hopefully have it finished in a couple more sessions!