15 minute potato box

Get a wooden box from the tip shop, put compost, potting mix, sheep poo in the bottom. Plant some potatoes - seed potatoes from a shop or ones from the kitchen that are starting to sprout. put about a 20-30cm layer of straw or leaves or other mulch. Keep adding more straw/mulch around around the stem of the potatoes as they grow up, until the box is full of straw and the plants have grown out of the box. Water regularly. Potatoes will grow off the stems off the plants in the mulch and hopefully you'll have have a box full of potatoes! Harvest when tops of plants start to die off (and stop watering at this point)
That's what i'm hoping for anyway- I'll let you know how it goes.