Buy. Finance. Part Exchange. Marshall Motor Group was established in 1909 and we are now the UK's 7th largest motor retail group (AM100 11/24), operating 136 franchise stores representing 25 manufacturer car, van, truck and bike brands across 34 counties in England. We are part of the Constellation Automotive Group which is the largest vertically integrated digital used car marketplace in Europe giving you peace of mind and transparency that you are dealing directly with a trusted company.