Fuel injector

A fuel injector for an internal combustion engine, comprising:

• a first valve needle having a bore for receiving a second valve needle, the first and second valve needles moveable along a common valve needle axis and arranged to control the injection of first and second fuels;
• first and second control chambers associated with the first and second valve needles respectively;
• a first control valve comprising a first control valve member and arranged to vary the pressure of a control fluid in the first control chamber so as to cause opening and closing movement of the first valve needle;
• and a second control valve comprising a second control valve member and arranged to vary the control fluid pressure in the second control chamber so as to cause opening and closing movement of the second valve needle;
• wherein both the first and second control valves are housed within a generally cylindrical body portion of the injector, and the first and second control valve members are arranged for linear movement along a common control valve axis offset from and parallel to a center axis of the body portion of the injector, wherein the control valve axis is offset from and parallel to the valve needle axis.