Four linked characters grace the grid. Which other member of the team was their captain?

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{Looking around the perimeter of the grid we find four of the characters in Are You Being Served (HUMPHRIES, BRAHMS, SLOCOMBE and LUCAS). The captain that led them was, of course, CAPTAIN PEACOCK. The word in the clue that the characters grace the perimeter refers to Grace Brothers, the fictional owners of the department store where the programme was set.}