Sue - if you want a song masterclass, then I personally would suggest the Shirley Collins ones - having had similar classes from Shirley in the past I think they may well be what you are after.

The Coope Boyes and Simpson harmony workshops I have attended in the past are not "Master classes" but they are OK for both experienced and relative beginners (although they provide sheet music, they do not assume sightreading abilities). I attended the last one (in Cranleigh) with choir hardened sight readers (I am one myself) and a couple of non-readers last time - and both thoroughly enjoyed themselves.

Valmai - sorry, my cheque hasn't been posted (Christmas got in the way) ... but it will be off to you tomorrow   :-(