Dg - As Roughyed said , most clubs are welcoming though in my opiniuon sometimes a little too sympathetic to new performers ! But fortunately , the 'You cant bring a guitar in here , this is a FOLK club' attitude that some 'traddy' clubs used to have is now a thing of the past , and in my experience ANY form of acoustic music that is well presented will be at least listened to ! And if Islington is your nearest club , you have a fair few others within easy reach by Public Transport !