You will often see this referred to as Trenchmore Farm as that's where it's made. They also sell very good meat and have a open taproom every Saturday which is well worth a visit.
A genuine farmyard cider as their cider shop is in one sheds around the side of the fine cow tepee. They only do 2 ciders but both are cracking. When I was visited them I was seriously tempted by their beef as well, but with a vegetarian partner, that may not have gone down well....
You can get this delivered nationally (it's not obvious on the site until you check out), but if you're in the East Sussex area it's worth making the diversion to say hi to the cows.