The only perhaps applicable portion in the Pilot Notes (September 1946, 3rd edition) I have is,
Hood jettisoning
The hood may be jettisoned in an emergency by pulling the rubber knob inside the top of the hood forward and downward and then pushing the lower edge of the hood outwards with the elbows.
WARNING.—Before jettisoning the hood the seat should be lowered and the head then kept well down.