Simple answer is I don’t know, sorry. I suggest emailing one of the contact numbers in the magazine. As far as I would know, we are ordinary BBKA members (or not) presumably like yourself. I could assume the mechanism of how it gets sent out, but that probably wrong. It will probably be only a matter of time when all this stuff goes online anyway.
I prefer to read a magazine but then you finish up with a pile of them that you don't want to throw away "just in case" but dont know where to put them.