From the OED, s.v. affiliate, v.: I.2.a. To attach a smaller institution to, or to connect it with, a larger one as a branch thereof; ... &c. No grammatical mistake here! As ever, Maxim 14:04, June 21, 2006 (CDT)
How can this be proven, etc.
Dear Dn Damick, If you live in the UK and are well acquainted with the activities of the Friends of Orthodoxy on Iona, then it is self-evident. Were the activities of the Friends and the geographical locale of its members published on the internet, then these references would establish the case. I propose the sentence in question be reintroduced. As ever, Maxim 03:30, June 28, 2006 (CDT)