Thje skimming technique was intended for contaminated runways to avoid engine ingestion.
Basically the nose wheel could be lifted off the tarmac after 80 knots but care was needed to ensure the nose was not allowed to get too high. The technique could be practised on dry runways and possibly had the bonus effect of giving the first class passengers a slightly more comfortable ride on the runway.
However, God had already provided the HS121 with an offset nosewheel so that it didn't have to ride over the centre line lights -- although some pilots failed to take advantage of this.