and was housing around 700 employees in 2017. United Kingdom In the United Kingdom, Peugeot Motor Company PLC is a wholly owned United Kingdom subsidiary of PSA Peugeot Citroën that operates the Peugeot UK, Citroën UK, and DS Automobile brands. Peugeot UK's retail arm is Robins & Day which was part of Rootes Group before becoming a wholly owned subsidiary of Peugeot Motor Company PLC in 1970. Other locations PSA has a number of manufacturing and development sites around the world. Vigo, in Galicia has PSA's biggest factory in the world. The PSA Mangualde Plant in Portugal produced its millionth vehicle in 2012. PSA invested 4 billion establishing new plant in Chennai, India. The group announced on 29 November 2016 at the Tunisia's investment conference 2020 it will open a factory plant in the country in mid-2018. The factory will have a planned annual production of 1,200 units. Groupe PSA (Paris:UG) has chosen to establish its new North American headquarters in Atlanta, Fulton County, Georgia. The headquarters will be operational by February 2018. A core team has already been set up to build the strategy and steer its execution. The decision to locate in Atlanta came after a yearlong, nationwide search to find the optimal balance of business environment, standard of living and workforce. Vehicles Notable vehicles and innovations Hybrid Air PSA Group exhibited the "Hybrid Air" engine, an experimental petro-hydraulic hybrid, at the 2013 Geneva Motor Show. The engine is the result of a secret development project involving about 100 people. The basic technology is not new—it has been used in heavy vehicles such as garbage trucks or buses which frequently start and stop—but its application to passenger cars is. The vehicle uses nitrogen gas compressed by energy harvested from braking or deceleration to power a hydraulic drive which supplements power from its conventional gasoline engine. The hydraulic and electronic components were supplied by Robert Bosch GmbH. Production versions were scheduled for 2015 or 2016 to sell at about US$25,000 or £17,000. Mileage was estimated to be about 3.5 L/100 km or 80 miles per gallon for city driving if installed in a Citroën C3. Awards Peugeot, Citroën, Chrysler Europe and DS vehicles have won many awards for their vehicles including: ten times the European Car of the Year award, 12 times the "Car of the year" Auto Europa award in Italy, 18 times the "car of the year"