You would do better to market your coops int the US. In the UK, there are many chicken coops you can buy, and a ton of manufacturers.
In the US there are really almost none. You can't buy a reasonably priced, well built premade coop or coop kit for half a dozen or so chickens in the US. There is mostly only the chick-n-barn, which isn't well designed or predator proof. After that, you have to spend $1000 or more. I know, I've looked.
Why try to fill a market that already has plenty to choose from, as in Britain? You should go for the US, which has virtually nothing to choose from.