The main problem , apart from L H 's excellent point , is that despite the obnoxious types who post here , your average UK Folkie is NICE ! And being nice , they find it very difficult to say to someone who has just done a Crap floor spot that that is what they have just done ! We ALL have off days - Even well established Professionals forget their lines - but there does seem to be a requirement for clubs to have a member responsible for quality , who can tactfully ask if a singer IS happy with their performance ,and suggest possible improvements .
Of course that is totally against ALL the Inborn Qualities that the Average Englishman (OR Scot , Irishman or Welshman) are brought up to exhibit .