Tomorrow, I'm planning (weather permitting), to make up some fertilizer for my vegetable garden. I hear that the UK is a very wet place. Where I live is also very wet and foggy. We kind of have a secret to growing here. We go around and find all the dead wood we can, and make charcoal from it, and then take that charcoal and break it up and soak it in well or rain water with whatever the soil needs. In my case it's going to be chicken manure, molasses, humic acid, and a bit of sourdough starter for the lactic acid bacteria. I might also throw in some stale corn meal and some fungusy bits of wood. The idea is that the charcoal will bond with the colonies of bacteria and fungi which will eat all the starchy or sugary stuff you put in and will ferment the lot of it into an optimal fertilizer which will then be available in your soil for a really long time, because charcoal doesn't break down in soil. It's a slow release fertilizer. That's important really, especially for areas with lots of rain. The charcoal gives the soil bacteria a place to inhabit so that they can convert the stuff in the soil and your additives into something plants can use, without it being washed out.