The seed potatoes have been chitting on a windowsill for several weeks now (you can read about chitting potatoes here) and finally I couldn't wait any longer to get growing.
I put a layer of home made compost (about three quarters rotted) in the bottom of the grow bags, about 10 cm worth. I also added a handful of wood ash and put the seed potatoes in, chits facing upwards, three to a bag. I added more compost and some bagged topsoil that we got from freecycle so that the potatoes were just about covered.
As shoots start to grow, I will keep covering them with more earth until the bags are full. If there is going to be a frost, I will lift the bags off the ground and protect them with some fleece. Hopefully, I will be harvesting my first potatoes of 2012 around May or June time.