With reference to the rear seat booster pins still fitted I was one of a number of rear crew who deliberately and regularly left the pin in. Our opinion was that if flying in turbulent conditions, especially in low level flight, we did not want an accidental firing of the cushion to happen when seated in our normal rear facing position with the possibility of trapping our legs under the table which, for the larger guys, may have required the use of a sharp aircrew knife to puncture it. In the event of a subsequent aircraft abandonment then any delay could have proved fatal.