Scenario. Elderly sparks rewires a flat. Is not part P and not 17th but been doing it all he's life. Work is to a high standard and if in doubt will ask. If I oversee the job and sign it off on a 3 part EIC. Myself doing the insp and test. In effect doing the job of building control. I know a lot of sparks approaching retirement in this position that pass a lot of work my way and feel obligated to help them in return in their final years. Is this acceptable