@Russell griffiths exactly that. I had all sanitaryware and radiators available in the garage 6 months before we needed them. Many times things were dragged out and measured or checked how they fitted etc, all first fix was completed to fit second fix items I already had.    Also exactly right about de-risking. My timer for example, arrived and the tiles were piled up in the required room, adhesive and grout was in the garage, box of trims was available. He had nothing to do or think a