Has anyone heard of the Eglu chicken housing? Apparently you can use it for rabbits as well. I don't know about any one else, but is it just me or it just looks on the whole far too small for one rabbit, let alone two:
http://www.omlet.co.uk/products_services/products_services.php?view=Rabbits
http://www.omlet.co.uk/products_services/products_services.php?view=Rabbits