DIY mate.
These things are made from recycled plastic.
£22.50 each or if you and your neighbour chip in together it works out £16.50 a piece.
Put in everything except blood or bone, so layers of clippings, kitchen scraps, shredded paper & *cardboard, chunks of hardarse soil/turf and when it gets almost full, nip down the angling shop for £5 worth of
Dendrobaena worms and put them on top the material. Keep feeding em with fresh kitchen waste and after a week or so they will have munched through the bulk, reducing the volume by 25%.
It takes a while for it all to decompose but if you have patience, after six months you can tip it all over and dig it into your patch or mix with the shop bought peat-free stuff to bulk it out, after a couple of weeks it's good to go.
*corrugated cardboard; the wrinkly bit in the middle is held in place with a sugar based glue, so when you just lay it on the ground not only does it retain moisture but also offers nutrition to encourage
mycelial growth. Which is the key really.
The mycelium is a sentient intelligence and it's the catalyst that maintains all growth by attaching itself to the root and transferring nourishment from the growing medium. Whether it's in your garden or the old forests, you might think you decide what flourishes but it's the mycelium that manages, regulates and maintains whatever grows there.