Vane cooling system

A gas turbine engine comprising a turbine section, the turbine section comprising a vane cooling system comprising:

• a vane arranged on a stator and having a chamber extending continuously from a radially inner end to a radially outer end of the vane,
• the vane having a first inlet and a second inlet;
• a first cooling fluid feed in communication with the first inlet,
• a second cooling fluid feed in communication with the second inlet,
• the first cooling fluid feed having a higher pressure than the second cooling fluid feed, the first cooling fluid feed having a constant flow,
• a flow adjustment device arranged for adjusting a flow of the second cooling fluid feed into the second inlet, the flow adjustment device operable to adjust flow of the second cooling fluid feed independently of the flow of the first cooling fluid feed, whereby to provide a top-up cooling flow to the chamber,
• wherein the chamber is divided by a plate to provide a main chamber and a wall-side chamber bordering the inner chamber, the first inlet enters the wall-side chamber and the second inlet enters the main chamber, and wherein the plate is configured to permit a restricted flow of air between the main chamber and the wall-side chamber.