A fuel management system for a gas turbine engine, the fuel management system comprising: a fuel supply line to configured to supply fuel from an inlet to a combustor of the gas turbine engine via a combustor valve, the fuel supply line comprising a first pump and a second pump, the first pump being configured to receive fuel and discharge it at a first low pressure, the second pump being provided by a combustor pump, the second pump being configured to receive fuel discharged from the first pump and discharge it at a second higher pressure for supply to the combustor; the combustor pump being disposed along the fuel supply line upstream of the combustor valve, configured to pressurise fuel to a delivery pressure for the combustor; a downstream heat exchanger configured to reject heat from a downstream thermal load of the gas turbine engine to fuel in the fuel supply line between the inlet and the combustor valve; wherein the combustor valve is configured to pass a burn portion of fuel from the fuel supply line to the combustor; wherein the fuel management system further comprises a downstream recirculation line configured to recirculate a downstream excess portion of fuel from the fuel supply line, the downstream recirculation line extending from a downstream recirculation point on the fuel supply line between the heat exchanger and the combustor valve; and wherein the downstream recirculation line is configured to recirculate the downstream excess portion of fuel for resupply to the fuel supply line; characterised in that the fuel management system further comprises: an upstream heat exchanger configured to reject heat from an upstream thermal load of the gas turbine engine to fuel in the fuel supply line upstream of the second pump; and an upstream recirculation line configured to recirculate an upstream excess portion of fuel from the fuel supply line, the upstream recirculation line extending from an upstream recirculation point on the fuel supply line between the upstream heat exchanger and the second pump; wherein the upstream recirculation line is configured to recirculate the upstream excess portion of fuel for resupply to the fuel supply line; and wherein the downstream heat exchanger is downstream of the upstream heat exchanger. a fuel supply line to configured to supply fuel from an inlet to a combustor of the gas turbine engine via a combustor valve, the fuel supply line comprising a first pump and a second pump, the first pump being configured to receive fuel and discharge it at a first low pressure, the second pump being provided by a combustor pump, the second pump being configured to receive fuel discharged from the first pump and discharge it at a second higher pressure for supply to the combustor; the combustor pump being disposed along the fuel supply line upstream of the combustor valve, configured to pressurise fuel to a delivery pressure for the combustor; a downstream heat exchanger configured to reject heat from a downstream thermal load of the gas turbine engine to fuel in the fuel supply line between the inlet and the combustor valve; wherein the combustor valve is configured to pass a burn portion of fuel from the fuel supply line to the combustor; wherein the fuel management system further comprises a downstream recirculation line configured to recirculate a downstream excess portion of fuel from the fuel supply line, the downstream recirculation line extending from a downstream recirculation point on the fuel supply line between the heat exchanger and the combustor valve; and wherein the downstream recirculation line is configured to recirculate the downstream excess portion of fuel for resupply to the fuel supply line; characterised in that the fuel management system further comprises: an upstream heat exchanger configured to reject heat from an upstream thermal load of the gas turbine engine to fuel in the fuel supply line upstream of the second pump; and an upstream recirculation line configured to recirculate an upstream excess portion of fuel from the fuel supply line, the upstream recirculation line extending from an upstream recirculation point on the fuel supply line between the upstream heat exchanger and the second pump; wherein the upstream recirculation line is configured to recirculate the upstream excess portion of fuel for resupply to the fuel supply line; and wherein the downstream heat exchanger is downstream of the upstream heat exchanger. an upstream heat exchanger configured to reject heat from an upstream thermal load of the gas turbine engine to fuel in the fuel supply line upstream of the second pump; and an upstream recirculation line configured to recirculate an upstream excess portion of fuel from the fuel supply line, the upstream recirculation line extending from an upstream recirculation point on the fuel supply line between the upstream heat exchanger and the second pump; wherein the upstream recirculation line is configured to recirculate the upstream excess portion of fuel for resupply to the fuel supply line; and wherein the downstream heat exchanger is downstream of the upstream heat exchanger.