A gas turbine engine system comprising: a gas turbine engine comprising at least one combustor including a plurality of fuel injection points configured to inject a fuel into said combustor at a plurality of different locations, said combustor configured to combust the fuel, the gas turbine engine rotatably coupled to a load through a shaft; and a control system comprising: a plurality of sensors positioned about the gas turbine engine system and configured to measure a parameter associated with the operation of the gas turbine engine; at least one sensor configured to determine fuel properties related to a heating value of the fuel; and a processor programmed to: receive a signal indicative of a current heating value of the fuel; and automatically generate a fuel control signal based on gas turbine engine load, ambient conditions proximate said gas turbine engine, and the signal indicative of the heating value of the fuel; and a plurality of fuel flow control devices configured to control an amount of fuel injected into the plurality of different locations using the fuel control signal; the gas turbine engine system being characterised in that the processor is further programmed to: determine a first fuel split setting at a first heating value of the fuel; determine a second fuel split setting at a second heating value of the fuel; determine a fuel split using the determined first and second fuel split settings; and apply the determined fuel split to control fuel flow to the combustor. a gas turbine engine comprising at least one combustor including a plurality of fuel injection points configured to inject a fuel into said combustor at a plurality of different locations, said combustor configured to combust the fuel, the gas turbine engine rotatably coupled to a load through a shaft; and a control system comprising: a plurality of sensors positioned about the gas turbine engine system and configured to measure a parameter associated with the operation of the gas turbine engine; at least one sensor configured to determine fuel properties related to a heating value of the fuel; and a processor programmed to: receive a signal indicative of a current heating value of the fuel; and automatically generate a fuel control signal based on gas turbine engine load, ambient conditions proximate said gas turbine engine, and the signal indicative of the heating value of the fuel; and a plurality of fuel flow control devices configured to control an amount of fuel injected into the plurality of different locations using the fuel control signal; the gas turbine engine system being characterised in that the processor is further programmed to: determine a first fuel split setting at a first heating value of the fuel; determine a second fuel split setting at a second heating value of the fuel; determine a fuel split using the determined first and second fuel split settings; and apply the determined fuel split to control fuel flow to the combustor. a plurality of sensors positioned about the gas turbine engine system and configured to measure a parameter associated with the operation of the gas turbine engine; at least one sensor configured to determine fuel properties related to a heating value of the fuel; and a processor programmed to: receive a signal indicative of a current heating value of the fuel; and automatically generate a fuel control signal based on gas turbine engine load, ambient conditions proximate said gas turbine engine, and the signal indicative of the heating value of the fuel; and receive a signal indicative of a current heating value of the fuel; and automatically generate a fuel control signal based on gas turbine engine load, ambient conditions proximate said gas turbine engine, and the signal indicative of the heating value of the fuel; and a plurality of fuel flow control devices configured to control an amount of fuel injected into the plurality of different locations using the fuel control signal; the gas turbine engine system being characterised in that the processor is further programmed to: determine a first fuel split setting at a first heating value of the fuel; determine a second fuel split setting at a second heating value of the fuel; determine a fuel split using the determined first and second fuel split settings; and apply the determined fuel split to control fuel flow to the combustor. determine a first fuel split setting at a first heating value of the fuel; determine a second fuel split setting at a second heating value of the fuel; determine a fuel split using the determined first and second fuel split settings; and apply the determined fuel split to control fuel flow to the combustor.