Try this http://www.bhwt.org.uk/cms/re-home-some-hens/
Or also there's the Omlet website (http://www.omlet.co.uk/homepage/), I got some chickens from there and I have a vague recollection of a mention of rehousing battery hens but I can't immediately see it on the website. However, they're very helpful staff so if you enquired I'm sure they'd point you in the right direction.