The Old North copy of this week's issue hasn't arrived yet, but the RW board feels that this explanation/survey is so important that they have made the cover article available to anybody with internet access, which seems especially relevant because one future option might be a non-print version.
http://bb.ringingworld.co.uk/files/2015-pp297-9.pdf
If for some reason the link doesn't work for you, I can send you the pdf as an attachment.
Laura Dickerson