I understood him as meaning the "official Church" like the one that the world thinks is the real Church, headed by the man known as Benedict. The "official" Church that plans to visit the head of the Orthodox church, pray at a mosque, blah blah blah. I believe that Bishop Williams was being a smart-aleck with that remark, that is his dry sense of humor. The real Church, not to be confused with the "official" is hidden and he is well aware of that.