Heheh 'zzuf' those NUMBERs were DRUMMED for sure even when disregarded (by newbies under stress) the engine would complain mightily to draw ones attention to 'the numbers'. :-) I'll post a graphic from the flight manual (it has appeared on a previous thread 'bout the VAMP silver ants. Meanwhile there is the cryptic text from a T.11 Vampire Pilots Notes:
Pilot's Notes VAMPIRE T.11 Part V - Emergency Handling Action in the event of fire
WARNING.- Fire in the engine bay may render the flying controls and pressure instruments useless, necessitating immediate abandoning of the aircraft. When Mod. 3418 is embodied the fire warning light may go out because the wiring has burned through.
(a) If the fire warning light comes on, close the throttle immediately, (If Mod. 3418 is embodied, the warning light(s) will go out when the temperature has dropped below 300 C, subject to the warning above.)
(1) Turn off H.P. and L.P. cocks. [High Pressure & Low Pressure Fuel Valves
(ii) Switch off the booster pump.
(iii) Reduce speed to 150 knots if possible and press the fire-extinguisher button.
(iv) Turn oxygen to emergency and turn OFF cockpit pressurisation.
(b) If the fire persists abandon the aircraft.
(c) When Mod. 3418 is embodied, if the warning light(s) goes out after the throttle is closed, a fractured air casing is indicated. It may be safe to use the engine under reduced power, but it is advisable to carry out actions (1) to (iv) unless the emergency dictates that the use of the engine be retained. If the engine is not shut down, unless the power used is small, further damage may be caused and the light will come on and remain on. Under these circumstances it is advisable therefore to throttle back every five minutes to check that the light goes out to indicate that a more serious fire has not started."