Top green tech that saves you money

Waste not, want not -- at least when there's worms about. The Reln Can-O-Worms is a brilliantly named and cleverly designed stackable wormery. Bung your leftovers in and the industrious wormy fellas inside take a break from lobbing bombs at each other to turn food into lovely compost that'll do wonders for your garden. It costs £90.