Thanks, Richard.
If it's likely that there isn't, maybe I should leave reference to these verses in Eph. and Peter.Whether there's an application to the twenty-first century I don't know.
Thanks, Mercia. While I think what you say is true, I also think it's worth emphasising that the true church most often is a visible organisation, hence the many letter in the NT to 'the church in such-and-such a city' which met together.
If you are speaking to Christadelphians I would drop the word "church" completely.