Big bag of frozen sausages from Asda. Other supermarkets are available but you're up north.
Hammer them into his lawn vertically.
Wait until thawed, and every bird/badger/hedgehog/dog/fox in the area has ripped his lawn a new one.
If it's a big enough lawn, words can be formed in Ardennes style trenches.
Like a big Art Attack.
OP, do you look like Neil Buchanen?
The other one I read on there, which is genius, is to save your used engine oil in a can - then pour some on their driveway, directly under their engine. They'll go NUTS trying to work out where the "leak" is coming from. Works best if they give a crap about their car, keep their car outdoors overnight, and have a concrete / paving slab driveway.
This is, of course, in lieu of an actual, suitable punishment for blatant animal cruelty (dismemberment, followed by eternity in the fieriest pits of Hell, with special punishment assignments being handed out by the Devil himself, such as "flay your own genitals and then rub them with salty lemon juice", "replace your toilet paper with a high velocity belt sander" and "use this bottle of Dorset Naga Chilli Sauce instead of eye drops").