I've decided to use Feather boarding (basically tempered wooden slats-treated) from B&Q. Cost me a total of £17.
I'll stain them up brown and hammer them into the ground.
Even if it does me for one year, it's saved me well over £200.
I would prefer to use the ever edge, but it's well overpriced no matter how good it is.
I would have needed 6 packs!!
Thanks everyone for their advice.