Hi Pignut
We have had hens for some time now, Black Rocks are a good breed to start with.
We recently got five more birds from the Battery Hen Welfare Trust.
www.bhwt.org.uk
Basically these are birds that come from battery cages and would normally go to slaughter, but they are still good layers.
From six birds we get a stead 5 or 6 eggs per day, Sunday last we had 10 eggs.
Their web site has LOADS of information for you with links to other places, including plans for hen houses, size of plot etc. take a look and I highly recommend keeping hens to anyone who has thought of it, not only do you get great fresh eggs at a fraction of the price from shops, but they help around the garden with pest control, weeding and fertilizing the soil.
PS, if you havent seen it, watch the animated film Chicken Run, you will see where they got the idea from as soon as you get your girls.