I saw this handy tip and thought you might like it
Ten easy steps to growing new potatoes in an old compost bag!
1. In February or March find an old compost bag.
2. Roll the empty compost bag down to half way.
3. Mix enough soil to fill half the bag with two handfuls of well-rotted manure.
4. Half fill the bag with the soil mixture.
5. Bury two seed potatoes just below the surface of the soil.
6. Place the bag in a light, frost-free place.
7. Roll up the plastic bag a few inches as the potatoes start to grow.
8. Just cover the growing potato shoots with soil