Oh I'm sorry!
OO is olive oil, CO is Coconut oil, SAO is sweet almond oil and SB is stick blender
HO means high oleic. It's really important to get high oleic sunflower oil as the regular one will get you DOS (dreaded orange spots)/rancidity in no time when used in higher amounts. I generally get sunflower frying oil, not sure what it's called in the UK, but I'm sure you'll be able to get it from the supermarket. If you want to be sure you can check the label. There has to be mainly mono-unsaturated fats and only a small amount of poly-unsaturated fats in the oil.
As
@KiwiMoose suggested, Zany's recipe produces a nice soap. It lasts long and has a lot less smush than regular high oleic soaps (also at 100% olive oil). It does produce quite a lot of soda ash though, which will cover up most of the design, so in my opinion it's best for single color or uncolored soaps. It also tends to get crumbly when cut from a loaf, so I think a lot of people used cavity molds (I didn't and regretted it..)