Gloster Javelin FAW.8 XH992 at NAM
Photographed on 13 January 2006 at Newark Air Museum, Notts, showing its 85 Squadron markings.
The reheat-capable FAW.8 was limited to using reheat only at a minimum altitude; below that point engaging the reheat actually caused a loss of thrust (to the point where take-off could not be safely accomplished with reheat engaged). This was down to the engine's fuel pump - it fed fuel at a constant rate and only at high altitude was there sufficient excess capacity to allow fuel to be burned directly without causing a loss of cold thrust at the same time. However the FAW.8 did have an improved, drooped, wing leading edge and autostabiliser to improve handling.
Picture added on 21 March 2008