I'm in the process of wiring up sockets and lighting to a new consumer unit in my shed. I plan on doing most of the wiring work myself before getting in a proper electrician that can tell me everything I've done wrong.

One mistake I want to avoid is making sure I actually wire it with suitable cable in the first place. I understand I'll need to use singles as I'll be using PVC conduit but as I'm only a DIYer and this is just a small installation I reckon I'll need only 25m of each colour cable but it seems that singles tend to be sold in 50/100m drums only.

My question is am I able to get away with wiring the whole thing with just one colour of cable i.e. all in black then sleeving or taping the terminations to indicate the correct colour of wire i.e. brown/blue/earth? I could also indicate the colour at inspection points as well to make it a little clearer.