Bloomer, in your situation, I'd grow them in long thin tubs - the sort of thing you might use as a windowbox. Poundstretcher have them for £3.00 each.
That way you can move them about, keep them out of the way of hens hopefully, and also take them with you when you next move house. Start off with a few plants (say four tubs at 3 plants per tub), then when they put out runners next year, stake them down in a pot of compost until they take root until they become your new plants.
We do this very successfully in the polytunnel. We've found it's important that they go outside in the winter so the frost can kill off weevils. The one year I didn't do this was a disaster! Also, the plants only seem to be productive for about 3 years, so we pot up the runners each year, which makes the whole thing self sustaining for no cost and minimum effort.
HTH!
Womble (Who's currently troughing a bowl of cornflakes and strawberries as he types
).