E.F.D.S.S. is still very much in existence. Their address (permanently engraved on my brain cuz I used to work there) is:

Cecil Sharp House
2 Regent's Park Road
London NW1 7AY

Their website is www.efdss.org and they do still seem to publish the Folk Directory as well as "Root Source" which I confess I have never seen. (I edited the F.D. for two years, but it was eons ago so don't anyone ask me WHICH two years!)