What CU did you purchase?Given what you have already done if you want hook up I would run some artic cable in conduit now, it’s not that expensive if you buy from an electrical wholesalers and then you can add the CU and sockets later. I put my consumer unit under the bonnet out of the way and used the grommet behind the battery to run the cable.
My general advice when wiring is buy your cable from sellers with a reputation to protect.
Copper is now very expensive so there is a lot of motivation for people to make cable with much less copper in, either by just lying about the cross sectional area or using aluminium coated in a thin layer of copper. Both are bad.
I'd avoid Facebook/Amazon/eBay unless you are sure it's an outlet of a well known seller.
I bought a couple of Vibe Car audio leads packs. The battery cables are labelled OFC stamped on the plastic and are so obviously CCA by their weight and colour when you cut them.I had problems with a seller palming me off with CCA cable as solid copper. Something to definitely be aware of.
Isn’t it more likely to fail than OFC though.You can use the copper clad aluminium wire but need to use a fatter guage than you would if the cable was pure copper ie. use 25mm2 cca instead of 16mm2 copper.
Because I would like to run the cables myself and then get it wired in.If you know nothing about electrics it might be best to get someone to put it in for you?
What do you want it to do?