I'll tick off some of the bigger ones;
Traction Group (Yorkshire Traction/Lincolnshire RoadCar/Strathtay), 2005
Glenvale Transport, Liverpool, 2005 (now the main legal entity for Stagecoach Merseyside, Chester & South Lancs)
Cooks Coaches, Somerset, 2007
Cavalier Travel, Long Sutton, 2008...