I'm a little wary about commenting here, Jim, as I don't wish to offend.

However, you say

"I believe most people can sing - if they put in the work they can improve their singing - if they reall work at it they can become bloody good singers "

This is true but there are other possibilities outwith the folk club scene whereby budding singers can hone their skills and gain confidence. e.g. community groups, courses, and workshops. Many of these also organise concerts, sessions, small get togethers which aren't too dissimilar to what many folk clubs do.

Several years ago, the Scots Music Group started up in Edinburgh and many people became interested in traditional music via this route and gained enough confidence to sing and play. They wouldn't have considered doing this via the folk club route which was considered to be very "cliquey" by many unless your were a part of it. Even many club regulars would be reluctant to have a go in case they upset the long term club performers or their input wasn't welcome. Also, if you are naturally shy, doing a floor spot for the first time can be a very daunting step.

There are many similar organisations to SMG up and down the country and plenty of other opportunities to get involved in folk music and song. Of course, they all imperfect and have their flaws just as folk clubs do. However, I think there's a place for everything.