A refrigerant vapor compression system comprising: a compression device having at least a first compression stage and a second compression stage arranged in series refrigerant flow relationship; a first refrigerant heat rejection heat exchanger disposed downstream with respect to refrigerant flow of the second compression stage for passing the refrigerant in heat exchange relationship with a flow of a first secondary fluid; a first refrigerant intercooler disposed intermediate the first compression stage and the second compression stage for passing the refrigerant passing from the first compression stage to the second compression stage in heat exchange relationship with the flow of the first secondary fluid, wherein the first refrigerant intercooler is disposed downstream of the first refrigerant heat rejection heat exchanger with respect to the flow of the first secondary fluid, wherein the refrigerant vapor compression system further comprises an intercooler bypass circuit for selectively establishing refrigerant flow communication from the first compression stage to the second compression stage without passing through the first intercooler, characterised in that the refrigerant vapour compression system further comprises: a second refrigerant heat rejecting heat exchanger disposed downstream with respect to refrigerant flow of the first refrigerant heat rejecting heat exchanger for passing the refrigerant in heat exchange relationship with a second secondary fluid; and a second refrigerant intercooler disposed intermediate the first compression stage and the second compression stage and downstream with respect to refrigerant flow of the first refrigerant intercooler for passing the refrigerant passing from the first compression stage to the second compression stage in heat exchange relationship with the second secondary fluid. a compression device having at least a first compression stage and a second compression stage arranged in series refrigerant flow relationship; a first refrigerant heat rejection heat exchanger disposed downstream with respect to refrigerant flow of the second compression stage for passing the refrigerant in heat exchange relationship with a flow of a first secondary fluid; a first refrigerant intercooler disposed intermediate the first compression stage and the second compression stage for passing the refrigerant passing from the first compression stage to the second compression stage in heat exchange relationship with the flow of the first secondary fluid, wherein the first refrigerant intercooler is disposed downstream of the first refrigerant heat rejection heat exchanger with respect to the flow of the first secondary fluid, wherein the refrigerant vapor compression system further comprises an intercooler bypass circuit for selectively establishing refrigerant flow communication from the first compression stage to the second compression stage without passing through the first intercooler, characterised in that the refrigerant vapour compression system further comprises: a second refrigerant heat rejecting heat exchanger disposed downstream with respect to refrigerant flow of the first refrigerant heat rejecting heat exchanger for passing the refrigerant in heat exchange relationship with a second secondary fluid; and a second refrigerant intercooler disposed intermediate the first compression stage and the second compression stage and downstream with respect to refrigerant flow of the first refrigerant intercooler for passing the refrigerant passing from the first compression stage to the second compression stage in heat exchange relationship with the second secondary fluid. a second refrigerant heat rejecting heat exchanger disposed downstream with respect to refrigerant flow of the first refrigerant heat rejecting heat exchanger for passing the refrigerant in heat exchange relationship with a second secondary fluid; and a second refrigerant intercooler disposed intermediate the first compression stage and the second compression stage and downstream with respect to refrigerant flow of the first refrigerant intercooler for passing the refrigerant passing from the first compression stage to the second compression stage in heat exchange relationship with the second secondary fluid.