does anyone know why/how a PIR done by a 2391 spark (not part of a scheme) is acceptable to LABC and yet an installation cert done by the same spark(for notifiable work) needs to be backed up by membership to a scheme ? I understand that some work is notifiable , would it be acceptable to supply a PIR for property that has had notifiable work done to it a week before by another spark who the client says has left the country ?