A method of controlling delivery of fuel to a plurality of duplex nozzles in the combustor of a gas turbine, each duplex nozzle comprising a primary orifice and a secondary orifice forming an orifice pair (46, 48), the method comprising: providing a single flow divider having a single fuel inlet and a plurality of fuel outlets, the flow divider providing fuel to each of the fuel outlets at a substantially identical flow rate; providing a single primary fuel supply line connected to each fuel outlet of the flow divider; conveying a liquid fuel from the fuel outlets through each respective primary fuel supply line at a predetermined rate; supplying the fuel from each primary fuel supply line to the primary orifice of a respective duplex nozzle; providing a secondary fuel supply line for each primary fuel supply line, each secondary fuel supply line having an inlet end connected to a respective primary fuel supply line between the primary orifice in a respective duplex nozzle and the connection of the primary fuel supply line to a respective fuel outlet of the flow divider, wherein each secondary fuel supply line extends from a respective primary fuel supply line to a secondary orifice in the respective duplex nozzle; providing a secondary valve between the connection of each secondary fuel supply line to a respective primary fuel supply line and a respective secondary orifice; identifying a predetermined operating condition of the gas turbine; and producing a signal in response to identifying the predetermined operating condition, the signal effecting actuation of the secondary valves in the secondary fuel supply lines from a closed position to an open position whereby, for each orifice pair (46, 48), fuel from each primary fuel supply line is conveyed through both the secondary orifice and the primary orifice located in the respective duplex nozzle, wherein said method includes the step of providing a fuel supply pumping a liquid fuel to said flow divider via a fuel control valve and a fuel line, wherein said method includes the step of providing a controller controlling operation of said fuel control valve and each of said secondary valves. providing a single flow divider having a single fuel inlet and a plurality of fuel outlets, the flow divider providing fuel to each of the fuel outlets at a substantially identical flow rate; providing a single primary fuel supply line connected to each fuel outlet of the flow divider; conveying a liquid fuel from the fuel outlets through each respective primary fuel supply line at a predetermined rate; supplying the fuel from each primary fuel supply line to the primary orifice of a respective duplex nozzle; providing a secondary fuel supply line for each primary fuel supply line, each secondary fuel supply line having an inlet end connected to a respective primary fuel supply line between the primary orifice in a respective duplex nozzle and the connection of the primary fuel supply line to a respective fuel outlet of the flow divider, wherein each secondary fuel supply line extends from a respective primary fuel supply line to a secondary orifice in the respective duplex nozzle; providing a secondary valve between the connection of each secondary fuel supply line to a respective primary fuel supply line and a respective secondary orifice; identifying a predetermined operating condition of the gas turbine; and producing a signal in response to identifying the predetermined operating condition, the signal effecting actuation of the secondary valves in the secondary fuel supply lines from a closed position to an open position whereby, for each orifice pair (46, 48), fuel from each primary fuel supply line is conveyed through both the secondary orifice and the primary orifice located in the respective duplex nozzle, wherein said method includes the step of providing a fuel supply pumping a liquid fuel to said flow divider via a fuel control valve and a fuel line, wherein said method includes the step of providing a controller controlling operation of said fuel control valve and each of said secondary valves.