FRANKFURT, Germany - BMW is to invest the equivalent of an extra R3.2-billion in its Mini brand over the next three years, marking a boost for the 5500 employees.The investment will mainly benefit BMW's manufacturing centre in Oxford, southern England, as well as factories in nearby Swindon and an engine plant near Birmingham in central England, the German firm said.'VITAL BASE'BMW said in a statement that this "comes on top of the R6.5-billion investment announced in June 2011 and means additional job security for the 5500 UK employees." Harald Krueger, a BMW board member, said BMW's total investment in Britain since 2000 now totalled about R22-billion.He added that Britain was "a vital manufacturing base" for BMW and stressed the firm's commitment to the Oxford plant. "Just as Munich is the centre of the BMW world, Oxford is and will remain the home and the heart of Mini."Cars from the Oxford plant are exported to more than 100 countries, including South Africa.