Once again, nothing too complicated. The single pole rotary switch has contacts rated 1 amp so can easily handle the 400 mA of current that the igniter takes. Here three rockets can be launched by rotating the switch. The Green LED provides continuity between battery,igniter and wiring. This extinguishes as the launch switch is pressed. Once again, observe safety precautions.

Mission Critical:
Heres a story about my own Estes space shuttle, on its one and only mission. This is what happens when you're too eager to get a rocket flying and don't pay attention to balance. It was a late November afternoon in 1998 when I first launched the shuttle. Lift off was perfect, no wind, clear skies (doesn't sound at all like England), and the rocket motor was a C6-5. At launch, the rocket motor fired, though lift off acceleration was not as good as I expected, I blame too much paint and excess weight). As my rocket reached apogee, (estimated height about 100 meters) and acceleration became zero there was no immediate separation between the shuttle and main fuel tank. There was of course a delay of 5 seconds between the rocket engine blowing its ejection charge. Five seconds is a long time too wait, especially when the forces excerted of gravity take hold. At 9.8 meters/second, the rocket plunged towards earth losing at least half its height. Then, thankfully the ejection charge blew, separation was achieved the the main fuel tank with SRB's drifted slowly down to earth on its parachute. However all was not well with the shuttle. It was only after separation that I realized there was too much nose weight (hence a heavy lift up and not enough height). The shuttle did glide, but only at about 45 degrees downward, picking up speed until eventually it crash landed in some soft mud. Luckily it survived the impact, I cleaned it up but have not yet removed the nose cone to balance the shuttle. I like it as an ornament anyway.