Foxfarms Ocean Forest and Foxfarms Happy Frog. First one third of your planter OF with 15% perlite and the next 66% HF with 20% perlite. You can literally finish out the grow using plain water. The OF is a lot hotter than the HF by the time the roots reach that layer they can handle the heat.

Forgot to mention. I'm in England and Fox Farms are only available on a US import

jimijames said:

Forgot to mention. I'm in England and Fox Farms are only available on a US import

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You should be able to source a good pre-fertilized organic soil in England somewhere. Look for something with similar ingredients found in Ocean Forest or whatever.

I found this online:
Ocean Forest® is a powerhouse blend of aged forest products, sphagnum peat moss, earthworm castings, bat guano, fish emulsion, and crab meal. Aged forest products, sandy loam, and sphagnum peat moss give Ocean Forest® its light, aerated texture.

Some believe that it isn't 100% organic, but I personally don't give a rats ass. Just look for the good stuff (bone meals, seed meals, guano's worm castings, minerals etc.). Do you have grow shops there? Other places to look are garden centers and the like. Before my state in the US became legal, I had to drive 2 hrs. just to get Fox Farm and other grow stuff (lights, pumps, grow tents etc.). Just to avoid shipping charges (shipping dirt is expensive).

i use biobizz all-mix for three years now and won't change it for anything else, growing in SOG 8 plants 6Lpots 90x60x180 (3'x2'x6')

you can have a look at my grow here https://growdiaries.com/grower/herbaledu/diaries you'll find an image of the custom nutrient schedule i use first week of each diary (roughly 2/3 dose with 2 weeks delay)