So finally took the plunge and subscribed to this KAL run by 
Isolda - have been meaning to join one for aaages, so about time...  I got some 
Old Maiden Aunt 4 ply (50% superwash Merino/50% silk) in a gorgeous purply colour, 'berry good' - photo to come once we get decent daylight!  I've just started to unwind the hank and hope to cast on tonight.