BOAC, the incident you describe above is sheer stupidity on the part of the crew/FO, not a failure of the procedure. The SOP in our company, at the end of the landing roll, the Captain states he has control, grabs the tiller, and the Captain is responsible for stowing the speed brake lever when he sees fit. This is then the cue for the FO to complete the rest of the checks. Its foolproof... so far.