As Dicko says, in a Rover there are two flasher cans, one for the hazards and a separate one for the indicators.
Before you ditch the indicator control arm, also check out the hazard switch - the indicator wiring goes from the control arm on the column to the hazard switch then off to the lights. The hazard switch is a double poll double throw that in the "on" position connects the hazard circuit to the lights but in the "off" position connects each indicator circuit to the lights.
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