They did a superb concert at Broadstairs Folk Week and I was privileged to take part in their 'workshop' but they did not get the 'tools' out ;-)
Sadly it was only a 2 hour session but was enough to get the hair standing up on the back of the neck!

Would really like to get involved with a choir like them. Only opportunities around here (Dartford, Kent, UK) appear to be Barbershop and 'formal' choirs.

[Someone at BFW suggested I should start a Mudcat thread to see if there is any interest in getting something like this going in this area. Will do this!]