Mass change does not happen that often in the British Touring Car Championship.
New regulations and manufacturer arrivals and departures aside, the scale of top-end driver/team line-up transformation ahead of the 2015 season is unparalleled since the dawn of the BTCC's Super Touring revolution in 1991.
Those days are long gone, but the BTCC is riding the crest of a wave at the moment, and that makes the changes for 2015 all the more pertinent.