“there are many tens of thousands of people registered on the site, most of whom we know nothing about – only an email address”
BT mooted the possibility of changes some time ago, but nothing has happened. I believe there were posters who offered advice on Forum software…..
We all agree this is an excellent Forum – but as you recognise it has grown significantly….. and you are excellent journalists, trying to resolve what fundamentally is a social networking / IT / open Forum – issue…….
You accept advertising revenue, (I guess you will advise it is minimal) why not return some of the revenue to enhance the Forum.