Re your first question Jacko at Jever in Germany in the late 50s we were required to have a first pair on 5 mins readiness (time to takeoff) with a second pair at 15mins. This was achieved from the crew room by strapping in, doing the checks to the point where the starter button was next then turning off the battery master and carefully getting out leaving all the straps ready for a quick return if scrambled. Usually, but not always, the state was raised to 2 mins if it looked like something was developing. This required us strapped in and on telebrief.
Each Hunter Sqn took it in turns to do a week of day time 'Battle Flight' as it was termed then (QRA being a modern expression) while Javelins covered the night hours.