Wire wool ,,,
All you need is wire wool and tacks, total cost £2.33
Unroll the wool, divided it into two strips and tack it all around
When you've finished, bunch it up either side of the tacks to make a prickly fence and your done!
Proof that it works ... notice 3 sneaky snails all facing away after failed attempts at getting in!
Well there you go, it worked and pretty eco! Might even work if you put it round fruit and veg on the ground ... Nice!