Just to clarify, both main and standby runways at Gatwick and most, if not all, other airports are not suitable for contaminated runway operations. Gatwick's standby runway is visual operations only, shorter length than the main, achieves less capacity than the main and has limited approach and ruway lighting, so when it snows and runways become contaminated the main is closed and swept with primary taxiway routes also swept, which may include part of the standby runway as it is used as a primary taxiway when not used as a runway.